Question

sin(A+B)sin(A-B)=? select the correct answer

Answer 1

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sin ( A + B ) sin ( A – B )

As we know,
( x + y ) ( x – y ) = x² – y²

So, we have to apply the above identity in the given equation .

sin ( A + B ) sin ( A – B )

= ( sinA + sinB ) ( sinA – sinB )

= sin²A – sin²B
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