Thread: Complex conjugate and absolute value

1. Complex conjugate and absolute value

Need help with following. Find the complex conjugate and absolute value of the following : a)-2 b)2-2i c)cosx + isinx d)e^-2iz

2. Originally Posted by myoplex11
a)-2
Write as $\displaystyle -2+0i$ change the imaginary part $\displaystyle -2-0i = -2$
b)2-2i
This is trivial.
c)cosx + isinx
$\displaystyle \cos x - i\sin x$

d)e^-2iz
Write as,
$\displaystyle \cos(-2iz)+i\sin(-2iz)$
$\displaystyle \cos (2iz)-i\sin (2iz)$