Question

can anyone help me with this question.

Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trig functions of t, whenever possible.
(a) -pi
(b) 6pi

Answer 1

cos(-pi)=cos(pi)=-1
Note: cos(-x)=cos(x), cos is an even function

cos(6π)=cos(0)=1
Note: cos(x)=cos(x-2kπ) where k is an integer.

sin(x) = sqrt(1-cos²(x))
tan(x) = sin(x)/cos(x)