Problem:
Find the norm and argument (phase angle in radians) of $2 \sqrt{5} e^{\frac{4 i \pi }{15}}$.
Answer:
Norm: $2 \sqrt{5}$
Argument: $\frac{4 \pi }{15}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/complex_norm_and_arg/21619.txt'}