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What is the right choice for question 37) ? http://postimg.org/image/9ikm61h8f/

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jayson94 | (Level 1) Salutatorian

Posted August 16, 2013 at 9:15 PM via web

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What is the right choice for question 37) ?

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted August 16, 2013 at 11:00 PM (Answer #1)

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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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