Question

Express the complex number in trigonometric form. -4

Answer 1

Answer:

4(cos180+itan180)

Step-by-step explanation:

Answer 2

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