Question
If $e^{i \theta}=\cos \theta+i \sin \theta$, then for $\Delta A B C, e^{i A} e^{i B} e^{i C}$ equals(a) $-\mathrm{i}$(b) 1(c) $-1$(d) $3 \mathrm{e}^{\text {it }}$
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Differentiation
Level III
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