Ingresso em 2015

Dado o número complexo z=1+i, a forma polar de z^3 é:

z=(\sqrt2)^3 \left[\cos \left({\large{3 \pi \over 4}} \right) +i \, \sin \left( {\large{3 \pi \over 4}} \right) \right]
z=2 \sqrt2 \left[ \cos \left({\large{\pi \over 2}} \right) + i \, \sin \left( {\large{ \pi \over 2}} \right) \right]
z=3 \sqrt2 \left[ \cos \left( {\large{3 \pi \over 4 }} \right) + i \, \sin \left( {\large{3 \pi \over 4}} \right) \right]
z=\sqrt2 \left[ \cos \left( {\large{ \pi \over 4}} \right) + i \, \sin \left( {\large{ \pi \over 4}} \right) \right]
z=(\sqrt3) \left[ \cos \left( {\large{\pi \over 4}} \right) + i \, \sin \left( {\large{ \pi \over 4}} \right) \right]