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OpenStudy (linda):
whats the cosine and sine of pi, abd the cosine and sine of 2pi over 3
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OpenStudy (amistre64):
cos(pi) = -1 sin(pi) = 0 cos(2pi/3) = -1/2 sin(2pi/3) = sqrt(3)/2
OpenStudy (amistre64):
some parts of the unit circle
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