Mathematics Trigonometry Trigonometric Functions

Find the value of cos 15° - cos 165° 

1
\(\dfrac{\sqrt3 + 1}{2}\)
2
\(\dfrac{\sqrt3 - 1}{\sqrt2}\)
3
\(\dfrac{\sqrt3 + 1}{\sqrt2}\)
4
\(\dfrac{\sqrt3 - 1}{2}\)

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