Math, asked by ravigupta2121, 10 months ago

sin A - cost A = 2 sin² A - 1

Answers

Answered by divyasingh81482

1

SinA-cosA=2sin^2a-1

SinA-cosA =cos2a

Sina=cos3a

Cos(90-a)=cos3a

90-a=3a

4a=90

A=22.5 ans

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