Evaluate
-\frac{a}{2}+\frac{1}{3}
Factor
\frac{2-3a}{6}
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a\cos(\frac{2\pi }{3})-\frac{1}{3}\left(-1\right)
Get the value of \cos(\pi ) from trigonometric values table.
a\cos(\frac{2\pi }{3})-\left(-\frac{1}{3}\right)
Multiply \frac{1}{3} and -1 to get -\frac{1}{3}.
a\cos(\frac{2\pi }{3})+\frac{1}{3}
The opposite of -\frac{1}{3} is \frac{1}{3}.
\frac{3a\cos(\frac{2\pi }{3})-\cos(\pi )}{3}
Factor out \frac{1}{3}.
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