Math, asked by bsdnfa20045, 4 months ago

cos^4- sin^4=cos^2- sin^2 prove it

Answers

Answered by dhruvbadaya1

2

cos⁴x-sin⁴x

=> (cos²x)² - (sin²x)²

=> (cos²x+sin²x)(cos²x-sin²x)

=> 1 (cos²x-sin²x)

=> cos²x-sin²x

Formulas Used

1. cos²x+sin²x=1

2. a²-b²=(a+b)(a-b)

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