Find the limit when X approaches zero
2xsinx/1-cosx

Find The Limit When X Approaches Zero2xsinx/1-cosx

Answers

Answer 1

Answer:

4

Step-by-step explanation:

[tex] Lim_{x \to 0}\frac{2 x\sin x}{1-\cos x} [/tex]

[tex] =Lim_{x \to 0}\frac{2 x\sin x}{1-\cos x}\times \frac{1+\cos x}{1+\cos x} [/tex]

[tex] =Lim_{x \to 0}\frac{2 x\sin x(1+\cos x) }{1^2 -\cos^2 x} [/tex]

[tex] =Lim_{x \to 0}\frac{2 x\sin x(1+\cos x) }{1 -\cos^2 x} [/tex]

[tex] =Lim_{x \to 0}\frac{2 x\sin x(1+\cos x) }{sin^2 x} [/tex]

[tex] =Lim_{x \to 0}\frac{2x(1+\cos x) }{sin x} [/tex]

[tex] =Lim_{x \to 0} 2(1+\cos x) \times \frac{1}{Lim_{x \to 0}\frac{sin x}{x}} [/tex]

[tex] =2(1+\cos 0) \times 1 [/tex]

[tex] = 2(1+1) [/tex]

[tex] = 2(2) [/tex]

[tex] \therefore Lim_{x \to 0}\frac{2 x\sin x}{1-\cos x}= 4 [/tex]


Related Questions

What is its potential energy when compressed by 0.25 m?

a. 1.25 Joules b. 33.33 Joules
c. 8.33 Joules d. 5.0 Joules​

Answers

For me the answer was C.

Can anyone help please???!?!?

Answers

Answer:

The third choice 2(a^3+3a^2h+3ah^2+h^3)

Step-by-step explanation:

f(a+h)=2(a+h)^3

Suppose that a random sample of eighteen recently sold houses in a certain city has a mean sales price of , with a standard deviation of . Under the assumption that house prices are normally distributed, find a confidence interval for the mean sales price of all houses in this community. Then find the lower limit and upper limit of the confidence interval.

Answers

This question is incomplete, the complete question is;

Suppose that a random sample of eighteen recently sold houses in a certain city has a mean sales price of $280,000, with a standard deviation of $10,000. Under the assumption that house prices are normally distributed, find a 95% confidence interval for the mean sales price of all houses in this community. Then find the lower limit and upper limit of the confidence interval.

Answer:

At 95%, confidence interval is ( 275026.7, 284973.3 )

Hence;

Lower limit = 275026.7

Upper limit = 284973.3

Step-by-step explanation:

 Given that;

mean x = $280,000

standard deviation σ = $10,000

sample size n = 18

degree of freedom df = n - 1 = 18 - 1 = 17

∝ = 1 - 95% = 1 - 0.95 = 0.05  

so

Critical t value = tinv( 0.05, 17 ) = 2.11

now, at 95% confidence interval for mean will be;

⇒ x ± [ Critical t value × ( σ/√n) ]

so we substitute

⇒ 280,000 ± [  2.11 × ( 10000/√18) ]

⇒ 280,000 ± [  2.11 × 2357.0226 ]

⇒ 280,000 ± 4973.3

⇒ 280000 - 4973.3, 280000 + 4973.3

At 95%, confidence interval is ( 275026.7, 284973.3 )

Hence;

Lower limit = 275026.7

Upper limit = 284973.3

Select the correct answer.
Gary's school won 70% of the basketball games played on their home court. What is the estimated probability that his school will win exactly one of the next three games at home?
Use the table to answer the question. The table shows the results of simulating this situation using a random number generator.
The numbers 0 to 6 represent a win on the home court, and 7 to 9 represent a loss on the home court.

479  787  293  926  807 398  730  994  718  184 978  400  904  488  508 241  729  673  178  982 556  355  137  241  430 500  379  811  147  260 250  704  631  109  287 172  870  124  557  192 803  588  674  856  678 385  981  830  972  949

A.) 0.04
B.) 0.10
C.) 0.34
D.) 0.60​

Answers

The answer is 0.34 because the answer is 0.34

Answer:

Step-by-step explanation:

0.34

Can someone help me out pls.
What was done to the previous equation?
A) 2x – 10. <--original equation
B) 11x – 10
C) -8 + 11x – 2
D) -8 – 11x – 2
E) -8 + 6x + 5x – 2
F) -8 – 3x + 5x – 2​

Answers

Ok ill answer the question but do you want me to evaluate it or find it to the simplest form ?

Is x = 2 a linear of function

Answers

Answer:

Yes it is.

Step-by-step explanation:

Because 2 has no exponents.

PLEASE HELPPP THIS TWOOO

Answers

Answer:

learning task 3.4

1) p-3

2) (8÷d)+6

3) 11-(9×4)

4) 4÷2

5) (10+6)÷4

Find the conjugate and product of

i3 + i7 ​

Answers

Answer:

Complex conjugate: 2i Product: -2i

Find the circumference of the circle and round to the nearest tenth

Answers

Step-by-step explanation:

Circumference of Circle =

[tex]2\pi \: r[/tex]

given d = 19.4mi

r = 1/2d

= 1/2 x 19.4

= 9.7mi

Circumference of Circle =

[tex]2\pi(9.7) \\ = 19.4\pi \\ = 60.9mi \: (nearest \: tenth)[/tex]

Which image below shows a line?

Answers

Answer:

where is the Picture?? I need to see the image to answer.

How many centimeters does it grow Bamboo grows 91 centimeters per day. per hour? (GIVING BRAINLIEST)​

Answers

Answer:

3.79 centimetres

Step-by-step explanation:

1 day = 24 hours

91 ÷ 24 = 3.79 centimetres

Answer:

if the question you're asking is how many cm does bamboo grow per hour, then around 3.81 cm per hour.

A density curve for all the possible weights between 0 pounds and 1000
pounds is in the shape of a rectangle. What is the height of the rectangle in
this density curve?
O A. 0.01
B. 0.0001
C. 0.001
O D. 0.1
SUBMIT

Answers

B. 0.0001
Is answer

( 7x + 1/2) + ( 7x - 7 and 1/2) Simplify

Answers

Answer:

The answer will be 7(2x - 1)

Step-by-step explanation:

1) Convert 7 and 1/2 to improper fraction. Use this rule: a b/c = ac + b/c

[tex]7x + \frac{1}{2} + 7x - \frac{7 \times 2 + 1}{2} [/tex]

2) Simplify 7 × 2 to 14 .

[tex]7x + \frac{1}{2} + 7x - \frac{14 + 1}{2} [/tex]

3) Simplify 14 + 1 to 15.

[tex]7x + \frac{1}{2} + 7x - \frac{15}{2} [/tex]

4) Collect like terms.

[tex](7x + 7x) + ( \frac{1}{2} - \frac{15}{2} )[/tex]

5) simplify.

[tex]14x - 7[/tex]

6) Factor out the common term 7.

[tex]7(2x - 1)[/tex]

Therefor, the answer is 7( 2x - 1 ).

Mrs smith earns 3,500$ a month. She saves 280$ a month. Savings is what percent of her income

Answers

Answer:

8%

Step-by-step explanation:

(there's many percentage calculators online) basically just look up "what percent is 280 of 3500')

What is the equation of the given line?
A. Y = -4x
B. X = 4
C. X = -4
D. Y = -4

Answers

The answer is D. Y=-4.

Explanation-
The equation goes across the Y axis not the X axis, therefore, you can eliminate B and C. There also is no slope so there should be no variable after the number. You can also eliminate A from there. Leaving you with the correct answer, D.

In the first week of​ July, a record 1,100 people went to the local swimming pool. In the second​ week, 100 fewer people went to the pool than in the first week. In the third​ week, 130 more people went to the pool than in the second week. In the fourth​ week, 350 fewer people went to the pool than in the third week. What is the percent decrease in the number of people who went to the pool over these four​ weeks?

Answers

What????????????????

Select the coefficents in the expression: 5x + 4 - 2x -1 *

Answers

Answer:

When you solve it, the leading coefficient is 3.

Step-by-step explanation:

Combine Like Terms:

=5x+4+−2x+−1

=(5x+−2x)+(4+−1)

=3x+3

Hope it helps :)

Answer:

The coefficients are 5, 4, 2 and -1

Step-by-step explanation:

Coefficients are the whole numbers

A train leaves Miami at 4:00 PM. A second train leaves the same city in the same direction at 8:00 PM. The second train travels 124mph faster than the first. If the second train overtakes the first at 10:00 PM, what is the speed of each of the two trains?

Answers

Distance travelled = speed x time
If we call the speed of the slower train S and the speed of the faster train F then
S x 6 hours = F x 2 = (S + 124) x 2
6S = 2S + 248
4S = 248
S = 62
So the slow train is travelling at 62mph and the fast train at 186mph

solve for x using the quadratic formula. x^2+9x+20=0

Answers

Answer: x= -4,-5

Step-by-step explanation:

Answer:

Step-by-step explanation:

I can help

Step 1

factor the left sides of the equation

Then you will get (x+4)(x+5)=0

Step 2

You will have to set the factors equal to 0

x=-4 or x=-5

Hope this helped

what is the measure of angle r in triangle QRS shown below, given r=10 q=20 and Q=100 round answer to the nearest tenth

HELP PLEASE

Answers

Answer:

29.3°

Step-by-step explanation:

Given triangle QRS with:

∠Q = 100° is opposite to q = 20∠R = ? is opposite to r = 10

Use the law of sines to solve:

sin 100 deg / 20 = sin x / 100.98 / 2 = sin ∠R  (rounded)sin x∠R = 0.49∠R = arcsin 0.49∠R = 29.3° (rounded)

Answer:

29.5

Step-by-step explanation:

original had 29.3 which is not an option. 29.5 is right.

HELP PLEASE A total of 29 bills amounts to $73.00. If there are only $1 and $5 bills, how many of each are there?​

Answers

Answer:

18 $1 bills and 11 $5 bills.

Step-by-step explanation:

First, we use the guess-and-check method.

$5X29=$145

Then, $5-$1=$4.

$145-$73=$72

$72 divided by 4 is 18.

29-11=18

11x$5=$55

$1x18=$18

$55+18=73.

Omg please help me. ​

Answers

Answer:

y=9.75x+60

Step-by-step explanation:

We want our equation to look like y=mx+b

Let's start out by calculating the slope

[tex]\frac{118.5-89.25}{6-3}=9.75[/tex]

we have

y=9.75x+b

we know that when x= 3 y= 89.25

89.25=9.75(3)+b

solve for b = 60

View the work below from a student last year. What was their mistake? Be detailed in their response.

-3(x + 4) = 2x - 5

-3x + 4 = 2x - 5

4 = 5x - 5

9 = 5x

1.8 = x

Answers

need to distribute -3

-3(x+4)=2x-5
-3x+12=2x-5
-5x=7
x=-7/5 or x=-1 2/5 or x=-1.4

help screenshot below

Answers

Answer: Isosceles Acute

Hope this helped! :)))

ANSWER AND STEPS PLEASE. HELP

A cone sits inside a cylinder, as shown. They share the same height and radius. What is the volume
of the cylinder not taken up by the cone? Use 3.14 for π.

Answer Choices
75.36 in.3

150.72 in.3

226.08 in.3

301.44 in.3

Answers

Answer:

A. 75.36 in^3

Step-by-step explanation:

r =3 in

h=8 in

v=1/3 π r^2h

= 1/3×3.14×3×8

=75.36 in^2

hope it helps...

have a great day!!

27 campers ate 567 pancakes during a week−long trip. If each camper ate the same amount, how many pancakes did each camper eat?

Answers

Answer:

23.6

Step-by-step explanation:

help please :((( this is the last math problem

Answers

Answer:

11.53 degrees.

Step-by-step explanation:

ok so we know the hyp and opp sides. this means that it is sin. according to SOHCAHTOA we do sin^-1(2/10). you should get 11.53

Answer:

11.5396°

Step-by-step explanation:

Please see the attached image

We can do sin(x)=2/10, which simplifies to sin(x)=1/5

To get x by itself do [tex]x=sin^{-1}[/tex](1/5) which ≈11.5396°

Share R600 amongst Tom, Paul and Anne in the ratio : 3:4:5 respectively.​

Answers

Step-by-step explanation:

Total Shares = 3 + 4 + 5 = 12 shares

12 Shares = R600

(12÷12) Share = R(600÷12)

1 Share = R50

(1×3) Shares = R(50×3)

3 Shares = R150

4 Shares = R(50×4) = R200

5 Shares = R(50×5) = R250

Tom Gets R150.

Paul gets R200.

Anne gets R250.

Type your answer into the box.
240 people are going to a charity event.
3/5 of the guests have ordered chicken for their meals.
Of the remaining guests, 12.5% have ordered gluten-free meals
How many people haven't ordered their meals yet?

Answers

Answer:

84 people

Step-by-step explanation:

Talk to me! How are you doing?

Answers

Step-by-step explanation:

we good and you.........

Answer:

Im doing great:) Just finishing up school work! And you ?

Step-by-step explanation:

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