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OpenStudy (anonymous):
what is tan^-1 -sqrt 3/3
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OpenStudy (xapproachesinfinity):
tan(pi/6)=root3/3 now try figuring when does tan get to be negative
OpenStudy (aum):
Reference angle = pi/6 tan is negative in the second and fourth quadrant. Therefore, the two angles in the interval [0, 2pi] are: ?
OpenStudy (anonymous):
use the unit circle tan, and follow exactly what the two others said
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