CalcNotes0102-page10 - Quadrants: S A T C A ll of the six...

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(Chapter 1: Review) 1.34 Why is it useful to deal with brothers? Coterminal “twins” have the same trig values, including the signs. Brothers have the same basic trig values up to (i.e., except maybe for) the signs. In other words, the basic trig values between two brothers are the same in magnitude, or absolute value. How do signs of trig values differ between quadrants? Remember that reciprocal values have the same sign. “ASTC” Think: “ A ll S tudents T ake C alculus” Start in Quadrant I and progress counterclockwise through the
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Unformatted text preview: Quadrants: S A T C A ll of the six basic trig functions are positive in Quadrant I. (They are all positive for acute angles.) S in and its reciprocal, Csc, are positive in Quadrant II. (The other four functions are negative.) T an and its reciprocal, Cot, are positive in Quadrant III. C os and its reciprocal, Sec, are positive in Quadrant IV. Example sin 7 6 = 1 2 , because sin 6 = 1 2 , and 7 6 is in Quadrant III....
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This note was uploaded on 12/29/2011 for the course MATH 150 taught by Professor Sturst during the Fall '10 term at SUNY Stony Brook.

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