allerysin(A + B) equals:
AcosA cosB - sinA sinB
BsinA cosB - cosA sinB
CsinA cosB + cosA sinB
DsinA + sinB
Answer & Solution
Correct answer: C. sinA cosB + cosA sinB
**Compound angle formula:** sin(A + B) = sinA cosB + cosA sinB.
(And sin(A - B) = sinA cosB - cosA sinB.)
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