Prove Sin(90-A)=cosA

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Igor Golodnitsky asked Apr 24, 2023

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Prove Sin(90-A)=cosA

Mathematics
college

Igor Golodnitsky asked Apr 24, 2023

by Igor Golodnitsky

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Explanation:

sin(90-A)=cosA

sin(90-A)=sin(90-A)

90-A=90-A

-A+A=90-90

DrBwts answered Apr 24, 2023

by DrBwts

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Explanation:

sin(90-A) = sin90cosA-sinAcos90

= cosA*1-0*sinA

= cos90

hence proved

Nneonneo answered Apr 28, 2023

by Nneonneo

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