Question

(a) (sin A + sin B) (sin A-sin B)
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Answer 1

Sin^2A-sin^2B

Explanation:

(sin A + sin B) (sin A-sin B)

=SinA(sinA-sinB)+SinB(sinA-sinB)

=Sin^2A-sinAsinB+sinBSinA-sin^2B

=Sin^2A-sin^2B