Question

Find the exact value of cos -1050.OA.-3OB.-12/2OC. 1OD. 1/3Reset Selection

Answer 1

Solution:

Given;

$\cos(-1050)$

Rewrite the expression using;

$\cos(-x)=\cos x$

Thus;

$\begin{gathered} \cos(-1050)=\cos(1050) \\ \\ \cos(1050)=\cos(330) \end{gathered}$

Then;

$\cos(330)=\frac{\sqrt{3}}{2}$

CORRECT OPTION: D