Write the following numbers in the polar form $๐๐^{๐๐}, โ๐<๐โค๐$:
$r$ = ?, $\theta$ =?
$$-\dfrac{\sqrt{7}(1+i)}{\sqrt{2}+ i} $$
When i used wolfram I got $r = 2.16025$ and $\theta = -170.264^{ยฐ}$. However, when I input this in WebAssign I got the right answer for $r$ but the wrong answer for $\theta$. I then tried doing $tan(-170.264^{ยฐ}) =.171579$ (in degree) and $tan(-170.264) = -.710889017$ (in radians), and they were both wrong. I'm lost what should be $\theta$ ?