httpimgurcomfW7ARbRSolution6

http://imgur.com/fW7ARbR

Solution

-(_/6)<=<=(_/6)

(t)=(_/6)cos(8t_/5)

angle is _/12

(_/6)cos(8t_/5)=(_/12)

cos(8t_/5)=(_/12)(6_/)

cos(8t_/5)=(1_/2)

(8t_/5)=2n-(_/3),(8t_/5)=2n+(_/3)

(8t_/5)=2n-(1_/3),(8t_/5)=2n+(1_/3)

t=(5_/8)(2n-(1_/3)),t=(5_/8)(2n+(1_/3))

t=(5_/4)n -(5_/24),t=(5_/4)n+ (5_/24) where n is the integer