Question

cos(-41*pi/6)

Answer 1

What is this problem asking you to do?

Answer 2

evaluate in exact form

Answer 3

If it's asking you to evaluate then the solution would be: \[Exact~Form: -\frac{ \sqrt{3} }{ 2 }\]

Answer 4

Subtract 2pi (in this case 12pi/6) from the angle a bunch of times first, to simplify it

Answer 5

I would probably first use the fact that cos(x) is an even function and therefore cos(-x)=cos(x)