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OpenStudy (anonymous):
x-intercepts, concavity and inflection points for 3cos(x)-cos^3(x)
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OpenStudy (tkhunny):
Have you considered the first two derivatives?
OpenStudy (anonymous):
\[-6\sin ^{2}(x)cosx+3\cos^3x-3cosx\] that's the second derivative
OpenStudy (anonymous):
just need the x-intercepts
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