Mathematics Trigonometry

Find the value of cos 75° 

1
\(\frac{\sqrt 3 -1 }{2\sqrt2}\)
2
\(\frac{\sqrt 3 +1 }{2\sqrt2}\)
3
\(\frac{\sqrt 3 -1 }{\sqrt2}\)
4
\(\frac{\sqrt 3 +1 }{\sqrt2}\)

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