#### Answer

The equivalent trigonometric form of $1 - i\sqrt{3}$ is $2cis300^\circ$ or $2(cos300^\circ + isin300^\circ)$.

#### Work Step by Step

$1 - i\sqrt{3}$ is at $300^\circ$ with absolute value $\sqrt{1^2 + (-\sqrt{3}})^2 = 2$. The equivalent trigonometric form of $1 - i\sqrt{3}$ is $2cis300^\circ$ or $2(cos300^\circ + isin300^\circ)$.