A point on the terminal side of an angle in standard position is given. Find the exact values of sin, cos, and tan.
a) sin = -1/2, cos = -√3/2, tan = 1/√3
b) sin = 1/2, cos = √3/2, tan = 1/√3
c) sin = -1/2, cos = -√3/2, tan = -1/√3
d) sin = 1/2, cos = -√3/2, tan = -1/√3