Express the complex number in trigonometric form.

-4i

Question

Express the complex number in trigonometric form. 

-4i

jdoe0001 · Answer

keep in mind that $\bf a+bi \implies r(cos(\theta)+isin(\theta)\
\bf -4i \implies 0-4i\
\begin{array}{cccl}
x&yi\
a&bi\
\hline\
\bf0&\bf -4i\
\hline\
r = \sqrt{a^2+b^2}
\end{array}$

jdoe0001 · Answer

so to convert it, find "r" by using the "a" and "b" components
then find the angle by using the "tangent" function with the "a" and "b" components

goformit100 · Answer

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