Trigonometry
posted by Sam .
I had to find the sine, cosine and tangent of 150 degrees. I got  sq. root of 3/2, 1/2, and  sq. root of 3/3. But my book has 1/2 as the sine, and sq. root of 3/3 as the cosine. Why is this? I thought that it was thirty degrees away from the axis, so I should use pi/3.

No. 150deg is not PI/3