This unit circle makes it easy to find the sin, cos, tan, csc, sec, cot without doing more work than needed. For example, to find the sin of 120 degrees you find 120 degrees on the circle. Next, you look at its coordinates and the y coordinate is the sin.So the sin120 is the square root of 3 divided by 2. To find the cos do the same thing, except that cos is the x coordinate. So the cos120 is negative one half. Finding the tan is a little harder. To find the tan120 you have to solve tan=sin(theta)/cos(theta). So you would have to solve the square root of 3 over 2 divided by negative one half. You have to flip negative one half and multiple it so the 2's cancel out and you're left with negative square root of three. To find the radian you just find the degree on the circle and the radian is listed below.
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April 2015
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