how to expand Rsin(Ɵ+alpha)?
i thought sin(a+B) = sina cosb + cosa sinb????
if thats true shouldnt it be
rsin Ɵ cos theta + rcosƟ sintheta??
Update:i meant i got Rsin Ɵ cos(alpha) + RcosƟ sin(alpha)
but the answersR[sin alpha cosƟ + cos alpha sin Ɵ]
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The answer in your last line is the same as the line above it. The only difference is the order in which it is written. Remember that both addition and multiplication are commutative.
it should be
Rsin Æ cos(alpha) + RcosÆ sin(alpha)