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OpenStudy (anonymous):
Find all theta in the interval [0, 2pi) that satisfy the equation. 2cos(theta)tan(theta)+tan(theta)=0
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OpenStudy (mandre):
2cos(theta)tan(theta) = -tan(theta) 2cos(theta) = -1 (divide both sides by tan(theta)) cos(theta)= -1/2 \[\theta=\cos ^{-1}(-\frac{ 1 }{ 2 })\]
OpenStudy (ybarrap):
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