Factor
\frac{18\cos(\frac{9x+\pi }{3})-\pi \cos(3x)}{6}
Evaluate
\frac{18\cos(\frac{9x+\pi }{3})-\pi \cos(3x)}{6}
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\frac{18\cos(\frac{9x+\pi }{3})-\cos(3x)\pi }{6}
Factor out \frac{1}{6}.
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