the value of sin theta cos (90 degree - theta) + cos theta sin (90 degree - theta) is
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cos(90-θ)=sinθ
sin(90-θ)= cos θ
sinθcos (90-θ)+cosθ sin(90-θ)
= sin θ*sinθ+cosθ cos θ
= sin ^2 θ+ cos ^2 θ
=1
sin(90-θ)= cos θ
sinθcos (90-θ)+cosθ sin(90-θ)
= sin θ*sinθ+cosθ cos θ
= sin ^2 θ+ cos ^2 θ
=1
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