Question

if a+b=90° then prove that cos^2 a + cos^2 b = 1​

Answer 1

Answer:

a+b=90°

a=90-b

cos^2(90-b)+cos^(b)

cos(90-b)=sin b°

sin^2b°+ cos^2 b°

sin^2b+cos^2b=1....

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