Question

prove that sin theta .cos(90-theta) +cos theta sin (90-theta)=1​

Answer 1

sin theta. cos(90-theta) + cos theta. sin(90-theta)
sin theta. sin theta + cos theta. cos theta
sin^2 theta + cos^2 theta [sin ^2 theta + cos^2 theta =1]
1

hence proved
sin theta. cos(90-theta) + cos theta. sin(90-theta)=1



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Answer 2

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