You should have them memorized from the unit circle.
The x-coordinate is the cosine value for that angle. The y-coordinate is the sine value for that angle. Tangent is ##sin / cos##, or in this case, ##y / x##. Secant is the reciprocal of cosine. Cosecant is the reciprocal of sine. Cotangent is the reciprocal of tangent (or ##x / y##)
Memorization tip: Memorize only the first quadrant, then just change the positive/negative of the coordinate for other quadrants!
