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Find $$\cos \left( { - \frac{{7\pi }}{2}} \right) = ?$$
Answer & Solution
Correct Answer:
Option
D
$$\eqalign{
& \cos \left( { - \frac{{7\pi }}{2}} \right) \cr
& = \cos 7 \times \frac{{180}}{2} \cr
& = \cos 630 \cr
& = \cos \left( {2 \times 360 - 90} \right) \cr
& = \cos 90 \cr
& = 0 \cr} $$
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