How to find cos11pi/3. what is the steps to find this

Cos (11π/3)

=cos (660)

=cos (360+180+90+30)

=cos (60)

=1/2

*Use the trigonometric quadrants to figure out the answer (All, Sin, Tan, Cos). And create the 60 degree right angled triangle with an adjacent side 1 and a hypotenuse of 2.