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With r the modulus and phi the argument, the polar form of z is
Ar(sin phi + i cos phi)
Br(cos phi - i sin phi)
Cr(cos phi + i sin phi)
Dr cos phi + sin phi
Answer & Solution
Correct answer: C. r(cos phi + i sin phi)
Real part r cos phi and imaginary part r sin phi combine into r(cos phi + i sin phi).
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