(sin²ACos²B - Cos²ASin²B)= (Sin²A-Sin²B).
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LHS = ( Sin² A Cos² B - Cos²A Sin² B )
=> Sin²A ( 1 - Sin²B ) - ( 1 - Sin²A ) Sin²B
=> ( Sin²A - Sin²B ) = RHS.
=> Sin²A ( 1 - Sin²B ) - ( 1 - Sin²A ) Sin²B
=> ( Sin²A - Sin²B ) = RHS.
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