Math, asked by mohitkumar76, 10 months ago

cos 4x = 1 - 8 sina x cos? x

Answers

Answered by spiderman2019

3

Answer:

Step-by-step explanation:

Cos 4x = cos 2(2x)

= 1 - 2sin²2x

= 1 - 2 (2sinxcosx)²

= 1 - 8sin²xcos²x

= R.H.S

Hence proved.

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