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OpenStudy (anonymous):
what is the cosine and sine of 240 degrees
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OpenStudy (mertsj):
What is the cosine and sine of 60 degrees. Because 60 is the reference angle.
OpenStudy (anonymous):
sin =radical 3 / 2 cos=1/2
OpenStudy (mertsj):
But 240 degrees is in the third quadrant. Is the cosine positive or negative in the third quadrant?
OpenStudy (anonymous):
positive
OpenStudy (mertsj):
The cosine is like x. Are x values positive or negative in the third quadrant?
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