Problem:
Find the norm and argument (phase angle in radians) of $3 e^{\frac{9 i \pi }{20}}$.
Answer:
Norm: $3$
Argument: $\frac{9 \pi }{20}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/complex_norm_and_arg/18020.txt'}