Asked by Anonymous
                Sin theta sin(90- theta) cos theta cos(90-theta)=0
            
            
        Answers
                    Answered by
            Steve
            
    recall that 
sin(90-θ) = cosθ
cos(90-θ) = sinθ
now see what you have.
    
sin(90-θ) = cosθ
cos(90-θ) = sinθ
now see what you have.
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