# Math Help - express in z=a+bi

1. ## express in z=a+bi

Perform the indicated calculation. Give your answer in the form z = a + bi
not sure how to go about it

2. All what you have to use is the [elementary] rule...

$(a^{b})^{c}= a^{b\cdot c}$

... and the [less elementary] Euler's formula...

$e^{i\cdot x}= \cos x + i\cdot \sin x$

Kind regards

$\chi$ $\sigma$