SOLUTION: If sin A sin B = cos A cos B , then cos(A

SOLUTION: If sin A sin B = cos A cos B , then cos(A - B ) = ?

Question 1011265: If sin A sin B = cos A cos B , then cos(A - B ) = ?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
by definition,
so, if , then

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