Using the Unit Circle: when finding sine of a number look at the second number in the coordinate. For example, the sine of 45 degrees would be the square root of 2 over 2. When finding the cosine of a number it is the first number in the co0rdinate. Example: the cosine of 210 is negative square root of 3 over 2. When finding the tangent of a number use the sine over cosine in the coordinates. Example the tangent of 30 is 1/2 divided by the square root of 3 over 2. Flip the second number 2 over the square root of 3. multiply across and multiply so the square root is not on the bottom