Question

Consider the angle in standard position whose measure is radians. The terminal side of this angle is in the third quadrant and lies on the line given by y=10x. Find sin and cos.

Answer 1

The nice thing is that the equations for sin and cosine automatically take into the signs involved.

consider the point (-1,-10) in the third quadrant. h = sqrt(101) and is always positive

sin = y/h = -10/sqrt(101) = -0.995
cos = x/h = -1/sqrt(101) = -0.0995

Answer 2

Sin therapists divide by 2

Answer 3

Sin theta divide by 2