On the unit circle:  0 degrees 90 degrees 180 degrees 270 degrees 360 degrees Or: pie/2 pie 3pie/2 2pie There are no steps when using the unit circle.  Sin Theta = y/r Cos Theta = x/r Tan Theta = y/x Csc Theta = r/y Sec Theta = r/x Cot Theta = x/y   Example 1 Show that the point P is on the unit circle. Solution: We need to show that this point satisfies the equation of the unit circle, that is, x2+y2=1. Therefore P is on the unit circle.