Question

What is the trigonometric form of `(-9-2i)`?

Answer 1

`Z= sqrt85(cos 3.36+isin3.36)`

Explanation:

`r=sqrt(2^2+9^2)=sqrt85` This is in 3rd quadrant. `/_alpha=tan^-1(2/9) =.22 rad :. theta = 3.14+.22 =3.36 rad` So in trigonometric form `Z= sqrt85(cos 3.36+isin3.36)`[ans]