Sin A + sin B=X and cos A + cos B =Y then cos (A-B) is equal to
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Hi Mate!!
Cos ( A - B ) = Cos ( A ) Cos ( B ) + Sin ( A ) Sin ( B )
Cos ( A - B ) = y² + x² -2 / 2
Cos ( A - B ) = Cos ( A ) Cos ( B ) + Sin ( A ) Sin ( B )
Cos ( A - B ) = y² + x² -2 / 2
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