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Math Help - trig 3

  1. #1
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    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).
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  2. #2
    Senior Member mollymcf2009's Avatar
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    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?
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  3. #3
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    Quote Originally Posted by mollymcf2009 View Post
    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
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  4. #4
    Senior Member mollymcf2009's Avatar
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    Look at this and see if this is what you need.
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