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OpenStudy (anonymous):
Determine the sign of sin five pi divided by four without using a calculator.
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OpenStudy (psymon):
Well if we just need the sign of the value....So a full circle is 2pi and we want 5/4ths of that. |dw:1375829196757:dw| So sine refers to a y-coordinate. That being said, if sine is a y-coordinate, is y positive or negative in that quadrant?
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