First slide

Trignometry

Question

$\cos (\frac{11 π}{6}) =$

Easy

A

$\frac{1}{2}$
B

$- \frac{\sqrt{3}}{2}$
C

0
D

$\frac{\sqrt{3}}{2}$

Solution

$\cos (\frac{11 π}{6}) = \cos 660 = \cos (720 - 60) = \cos 60 = \frac{1}{2}$

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