Answer
The equivalent trigonometric form of $11 + 2i$ is $11.18cis10.30^\circ$ or $11.18(cos10.30^\circ + isin10.30^\circ)$.
Work Step by Step
For $11 + 2i$, the absolute value is $\sqrt{11^2 + 2^2} = 11.18$ and $\theta = arctan(\frac{2}{11}) = 10.30^\circ$, since $11 + 2i$ is in the 1st quadrant.
Therefore, the equivalent trigonometric form of $11 + 2i$ is $11.18cis10.30^\circ$ or $11.18(cos10.30^\circ + isin10.30^\circ)$.
