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OpenStudy (anonymous):
tan^-1 sqrt(3)/3 find exact value of expression
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OpenStudy (raden):
30 degrees, if it is in the 1st quadrant
OpenStudy (anonymous):
how did you get that?
OpenStudy (raden):
it is special angle in trigono, i have to memorize all to make be easier :)
OpenStudy (raden):
210 is correct to (if it is in the 3rd quadrant)
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