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Solving Trigonometric Equations. . . Quadrant I. Quadrant II. Quadrant III. Quadrant IV. Cosine. All. Sine. Tangent. 1800 - q. 1800 q. CAST Rule. Find the measure of q.. 0 = q < 3600. a) cos q = -0.6691. 3600 - q. q. The reference angle is 480. . The angle q is foundin Quadrants II and III..
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