Need help with a trigonometry proof: sin ⁡ ( 90 − θ ) = cos...

uplakanimkk

uplakanimkk

Answered

2022-07-07

Need help with a trigonometry proof: sin ( 90 θ ) = cos θ

Answer & Explanation

SweallySnicles3

SweallySnicles3

Expert

2022-07-08Added 21 answers

You can use the formula sin ( A B ) = sin A cos B cos A sin B ,, so
sin ( 90 θ ) = sin 90 cos θ cos 90 sin θ cos θ .

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