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Prove Sin(90-A)=cosA
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1 vote
Prove Sin(90-A)=cosA

User Niels Hoogendoorn
by
3.3k points

2 Answers

3 votes

Explanation:

sin(90-A)=cosA

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

90-A=90-A

-A+A=90-90

=0

Prove Sin(90-A)=cosA-example-1
User Syed Habib M
by
3.5k points
6 votes

Explanation:

sin(90-A) = sin90cosA-sinAcos90

= cosA*1-0*sinA

= cos90

hence proved

User Watkins
by
3.4k points
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