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sin(A+B).sin(A-B)=cos^2B-cos^2A

sin(A+B).sin(A-B)=cos^2B-cos^2A

Grade:10

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
6 years ago
Dear student,sin(A+B).sin(A-B)=sin2A-sin2B and can be easily proved. Now you can use the identity sin2A + cos2A =1 to prove sin(A+B).sin(A-B)=cos2B-cos2A. Thanks

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