SOLUTION: Sin (90-A) Sin A -cos (90-A) Cos A

SOLUTION: Sin (90-A) Sin A -cos (90-A) Cos A

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Question 1083591: Sin (90-A) Sin A -cos (90-A) Cos A

Answer by ikleyn(52834) (Show Source): You can put this solution on YOUR website!
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= -cos((90-A) +A) = -cos(90) = 0.

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