Question

Can we add: sin 2 70' + sin 2 20' , to get 1

Answer 1

LHS : Sin ^2 70+sin ^2 20 = sin^2 70+ sin ^2 (90-70) = sin^2 70 + cos^2 70 = 1 , RHS Bcz we have identity sin(90-theta)= cos theta , sin ^2 theta + cos^2 theta = 1

Answer 2

LHS : Sin ^2 70+sin ^2 20

= sin^2 70+ sin ^2 (90-70)

= sin^2 70 + cos^2 70

= 1

, RHS

Bcz we have identity sin(90-theta)= cos theta

, sin ^2 theta + cos^2 theta = 1

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