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In polar form z = r(cos θ + i sin θ), r is called the ___ and θ is the ___:

AConjugate; phase
BModulus; argument
CArgument; modulus
DReal part; imaginary part
Answer & Solution
Correct answer: B. Modulus; argument
r = |z| is the modulus (magnitude). θ is the argument (angle from positive real axis). r and θ together specify z in polar form.
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