# express in z=a+bi

• Apr 14th 2009, 10:58 PM
gabet16941
express in z=a+bi
Perform the indicated calculation. Give your answer in the form z = a + bihttp://www.webassign.net/www32/symIm...f15bb23f3a.gif
not sure how to go about it
• Apr 15th 2009, 12:52 AM
chisigma
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

$\chi$ $\sigma$