3 years ago

Can someone pls help me on this ASAP

Mathematics

1 answer:

Alika [10]3 years ago

4 0

Answer:

Domt sask me

Step-by-step explanation:

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(1+cos2x)/(1-cos2x) = cot^2x

sesenic [268]

We will turn the left side into the right side.

$\dfrac{1 + \cos 2x}{1 - \cos2x} = \cot^2 x$

Use the identity:

$\cos 2x = \cos^2 x - \sin^2 x$

$\dfrac{1 + \cos^2 x - \sin^2 x}{1 - ( \cos^2 x - \sin^2 x)} = \cot^2 x$

$\dfrac{1 - \sin^2 x + \cos^2 x }{1 - \cos^2 x + \sin^2 x} = \cot^2 x$

Now use the identity

$\sin^2 x + \cos^2 x = 1$ solved for sin^2 x and for cos^2 x.

$\dfrac{\cos^2 x + \cos^2 x }{\sin^2 x + \sin^2 x} = \cot^2 x$

$\dfrac{2\cos^2 x}{2\sin^2 x} = \cot^2 x$

$\dfrac{\cos^2 x}{\sin^2 x} = \cot^2 x$

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8 0

3 years ago

If the area of a circle is 81π, then what is the diameter of the circle?

viva [34]

Answer:

Step-by-step explanation:

81π=πr^2

r= 9,-9

9+9=18

7 0

3 years ago

The circumference of a circular garden is 131.88 feet. What is the radius of the garden?

soldi70 [24.7K]

Answer:

21 ft

Step-by-step explanation:

C = 2πr

Filling in the given values, we have ...

131.88 ft = 2·3.14·r . . . . we can find r by dividing by its coefficient

131.88 ft/6.28 = r = 21 ft

3 0

3 years ago

Ronald’s insurance company pays for 80% of his shoulder surgery, after he pays a $500 deductible.

Ivahew [28]

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4 years ago

calculate the total surface area and volume a cone of base diameter 14cm and height of 5 cm ( take pi= 22/7

arlik [135]

Answer:

surface area= 245.18. volume=256.67

Step-by-step explanation:

use the formula

sorry if im wrong

4 0

3 years ago