alleryThe expansion of $\sin(A+B)$ is:
A$\sin A\cos B - \cos A\sin B$
B$\cos A\cos B - \sin A\sin B$
C$\sin A\sin B + \cos A\cos B$
D$\sin A\cos B + \cos A\sin B$
Answer & Solution
Correct answer: D. $\sin A\cos B + \cos A\sin B$
Angle-sum identity: sin(A+B) = sinA cosB + cosA sinB.
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