What is the value of $$\cos \left( { - \frac{{17\pi }}{3}} \right)?$$

A. 1

B. $$\frac{{\sqrt 3 }}{2}$$

C. $$\frac{1}{2}$$

D. 0

Answer: Option C

Solution(By Examveda Team)

$$\eqalign{ & \cos \left( { - \frac{{17\pi }}{3}} \right) \cr & = \cos \left( { - \frac{{17 \times 180}}{3}} \right) \cr & = \cos \left( { - 1020} \right) \cr & = \cos \left[ {3 \times 360 - 60} \right] \cr & = \cos 60 \cr & = \frac{1}{2} \cr} $$