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OpenStudy (anonymous):
solve 3tan2x-9=0 in interval [0,2pi)
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OpenStudy (anonymous):
tan 2x = 9/3 = 3 = tan 71.57 deg. 2 answers within period (0 < x < 2Pi) x1 = 71.57/2 = 35.78, and x2 = 35.78 + 180 = 215.78 deg
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