Question

prove that sin theta sin(90°-theta)- cos theta cos(90°- theta)=0.

Answer 1

HOLA

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We know that , Sin ( 90 - theta) = Cos theta

Cos ( 90 - theta ) = Sin theta

So here we have ,

Sin theta - Sin(90 - theta) - Cos theta - Cos(90 - theta )

Sin theta - Cos theta - Cos theta - Sin theta = 0

So , RHS = LHS

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HOPE U UNDERSTAND

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