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Jay Khan · Answer 1 · 2021-06-08T06:25:36+0000

Answer:

Explanation:

cos²A+sin²A,Cos 2B

=1-sin²A+sin²A.cos 2B

=sin²A(-1+cos2B)

=-sin²A(1-cos2B)

=-sin²A. 2sin²B

=-2sin²A sin²B