Y u put 2(cos2x)^2?

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Maths

This question was asked in Ex 3.3, 24

y u put 2(cos2x)^2?

Vk Vk

July 5, 2017, 9:18 a.m.

Answers!

Davneet Singh

July 5, 2017, 10:03 a.m.

Hi

Did you see the rough box?

We use the formula

cos 2x = 2cos² x - 1

Putting x = 2x

cos 2(2x) = 2 cos² (2x) - 1

cos 4x = 2 cos² 2x - 1

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