# How do you write 1 in trigonometric form?

$\cos 0 + i \sin 0$
$\text{note that}$
$\cos 0 = 1 \text{ and } \sin 0 = 0$
$\Rightarrow 1 = 1 \left(\cos 0 + i \sin 0\right) \leftarrow \textcolor{red}{\text{ in trigonometric form}}$