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Which identity lets us derive de Moivre's formula using the exponential law for integer powers?
AThe Cauchy inequality
BPascal's triangle rule
CEuler's formula
DLagrange's identity
Answer & Solution
Correct answer: C. Euler's formula
Raising e^(ix) = cos x + i sin x to the power n gives e^(inx) = cos nx + i sin nx.
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