Answers: 3
is a complex number that satisfies![\begin{cases}r\cos x=-3\\[1ex]r\sin x=4\\[1ex]r=\sqrt{(-3)^2+4^2}\end{cases}](/tpl/images/0488/9358/cb971.png)
.![\begin{cases}\cos x=-\dfrac35\\[1ex]\sin x=\dfrac45\end{cases}](/tpl/images/0488/9358/d7f12.png)
. This is important to know because it's only the case that 
whenever 
. The inverse doesn't exist otherwise.
, we have
.
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Do you know the correct answer?
Write -3+4i in the form r(cosx+isinx)...
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