2 Answers

Federom · Answer 1 · 2019-03-24T00:24:50+0000

Ok this is a negative number.
All negative numbers have argument
$\pi$
Obviously, the module of this number is
$\vert-4\vert=4$
The general trigonometric form of a complex number is:

$z=\vert z\vert(cos\theta+i\sin\theta)$
We deduce the trigonometric for of -4:

$-4=4(cos\pi+i\sin\pi)$

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