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OpenStudy (anonymous):
For what x-value(s) does cos(x) = -1? A. -270°, -90°, 90°, and 270° B. -270°, -90°, 0°, 90°, and 270° C. -180° and 180° D. -360°, 0° and 360°
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OpenStudy (unklerhaukus):
|dw:1324260687595:dw| C. -180°, 180°
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