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What is the value of $$\cos \left( { - \frac{{17\pi }}{3}} \right)?$$
Answer & Solution
Correct Answer:
Option
C
$$\eqalign{
& \cos \left( { - \frac{{17\pi }}{3}} \right) \cr
& = \cos \left( { - \frac{{17 \times 180}}{3}} \right) \cr
& = \cos \left( { - 1020} \right) \cr
& = \cos \left[ {3 \times 360 - 60} \right] \cr
& = \cos 60 \cr
& = \frac{1}{2} \cr} $$
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