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The CAST rule applies to the positive values of functions in the xy-plane. C starts in quadrant 4 therefore only the cosine is positive in quadrant IV. AST moves in the counterclockwise direction for each quadrant. A is in quadrant I which indicates ALL (sine,cosine, and tangent) are positive in quadrant I, S is quadrant II which indicates only the sine is positive in quadrant II, and T indicating tangent is positive in quadrant III.
Therefore the CAST rule applies to choice: "d"
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