Use the even-odd properties to find the exact value of the expression. Do not use a calculator.
-$\sin \left( - 120 ^ { \circ } \right)$
A) $- \frac { \sqrt { 3 } } { 2 }$
B) $\frac { - 1 } { 2 }$
C) $\frac { \sqrt { 3 } } { 2 }$
D) $\frac { 1 } { 2 }$

Question

Quizplus · Accepted Answer

The sine function is odd, meaning $\sin(-\theta) = -\sin(\theta)$. Therefore, $\sin(-120^\circ) = -\sin(120^\circ)$. Since $\sin(120^\circ) = \frac{\sqrt{3}}{2}$, $\sin(-120^\circ) = -\frac{\sqrt{3}}{2}$.

Use the Even-Odd Properties to Find the Exact Value of the Expression