Question

The trigonometric form of -5+4i is ?

Answer 1

you mean polar form?

Answer 2

r(cos theta+ i sin theta)

Answer 3

\[x+yi=-5+4i\]
=>
x=-5
y=4
\[r=\sqrt{x^2+y^2}\]
We do
\[\theta=\tan^{-1}(\frac{y}{x})+180\]
Since \[\theta\]
is in the second quadrant

Answer 4

so r=√41 i think

Answer 5

why do you add 180 ?

Answer 6

so i got theta = -38