# Math Help - trig 3

1. ## trig 3

The CAST Rule describes the sign of the three primary trigonometric ratios as the angle varies from 0° to 360°. Describe how the CAST Rule relates to the behavior of the graphs of each of y = sin(x), y = cos(x) and y = tan(x).

2. I use the pneumonic device: All Students Take Calculus

Starting in quadrant I, where all the trig functions are positive, moving counter-clockwise. So in Quadrant II, sin values are positive, Q III tangent values are positive, Q IV cosine values are positive.

Is this what you were trying to figure out?

3. Originally Posted by mollymcf2009
I use the pneumonic device: All Students Take Calculus

Starting in quadrant I, where all the trig functions are positive, moving counter-clockwise. So in Quadrant II, sin values are positive, Q III tangent values are positive, Q IV cosine values are positive.

Is this what you were trying to figure out?
I know what the CAST rule is but i don't know how it relates to the behaviors of the graphs i listed

4. Look at this and see if this is what you need.