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OpenStudy (anonymous):
tan(2x)=-1
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OpenStudy (campbell_st):
you are looking at 2nd and 4th quadrant angles so find 2nd quadrant \[2x = 180 - \tan^{-1} (1)\] 4th quadrant \[2x = 360 - \tan^{-1}(1)\] then halve both answers to find x.
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