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)
$$\eqalign{ & \cos \left( { - \frac{{17\pi }}{3}} \right) \cr & = \cos \left( { - \frac{{17 \times 180}}{3}} \right) \cr & = \cos \left( { - 1020} \right) \cr & = \cos \left[ {3 \times 360 - 60} \right] \cr & = \cos 60 \cr & = \frac{1}{2} \cr} $$This Question Belongs to Arithmetic Ability >> Trigonometry
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