Question Number 35232 by abdo.msup.com last updated on 17/May/18
$${what}\:{is}\:{the}\:{value}\:{of}\:{cos}\:{z}\:{and}\:{sinz} \\ $$$${if}\:{z}={re}^{{i}\theta} \:\:\:\:{r}>\mathrm{0}\:\:? \\ $$
what-is-the-value-of-cos-z-and-sinz-if-z-re-i-r-gt-0-