Math, asked by pratapabir6959, 1 year ago

prove that sin2theta+cos2theta=1

Answers

Answered by sandy1816

1

Step-by-step explanation:

let a right angle tringle ABC,with angle B=90°

sinA=BC/AC & cosA=AB/AC

sin²θ+cos²θ=(BC/AC)²+(AB/AC)²

=BC²+AB²/AC²

=AC²/AC²

=1

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