Chapter SH, Problem 13.11EP

To determine

To find:

The each expression into trigonometric form

Answer to Problem 13.11EP

The exact value is $0.8660$

Explanation of Solution

Given:

  $\sin \left(-{120}^0\right)$

Concept used:

Trigonometric ratios: - Atrigonometric ratio are the ratios between edges of a right triangle.

Calculation:

Trigonometric ratio is

  $\begin{array}{l}=\sin \left(-{120}^0\right)\\ =\sin \left(\frac{2\pi }{3}\right)\\ =-\frac{\sqrt{3}}{2}\\ =-0.8660\end{array}$