Question

prove that sin 2A + sin 2B + sin (A+B) = 4 cos A cos B sin(A+B)

Answer 1

Answer:

There is a formula that says.

If A + B + C = π.

sinA + sinB + sinC = 4 cos(A/2). cos(B/2). cos(C/2).

hope it may help me.

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