anonymous 5 years ago express the complex number in polar form there are two different problems 5.2i 6+4i

1. anonymous

(5.2) < 90 7.2111 < 33.69

2. anonymous

how tho i need to learn this :(

3. anonymous

$i = cos(\frac{\pi}{2})+ i sin(\frac{\pi}{2})$ so first answer is $5.2(cos(\frac{\pi}{2})+ i sin(\frac{\pi}{2}))$

4. anonymous

great website to learn: http://www.intmath.com/complex-numbers/4-polar-form.php

5. anonymous

in general $a+bi=r(cos(\theta)+isin(\theta))$ $r=\sqrt{(a^2+b^2)}$ $tan(\theta)=\frac{b}{a}$

6. anonymous

perhaps i read the problem wrong. is the first one 5.2i or 5+2i?