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OpenStudy (anonymous):
Find all soultions for sec3x=-1
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OpenStudy (ddcamp):
\[\frac{ 1 }{ \cos(3x) } = -1\] Solve for cos(3x), Then use the unit circle.
OpenStudy (anonymous):
cos(3x)=-1, 3x=180, hence x=60 (of course you could add or subtract 360n)
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