Math, asked by amirbakyt, 1 year ago

cos^2acos^2b-sin^2asin^2b=cos^2a-sin^2b

Answers

Answered by uknaresh1234radhe

0

= (cosa cosb)^2 - (sina sinb)^2

= (cosa cosb - sina sinb) + (cosa cosb + sina sinb)

= cos(a-b)cos(a+b)

= cos^2a-sin^2b

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