Use the identity sin A cos B = 1 2 (sin( A + B) + sin( A B)), to show that solution (20)
Chapter 10, Problem 19(choose chapter or problem)
Use the identity sin A cos B = 1 2 (sin( A + B) + sin( A B)), to show that solution (20) of the problem of equations (1), (3), and (9) can be written in the form (28).
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