$+6a+12a$
$18\::\:-9$
$2sinx\left(cos20x\right)=8sinx$
$\sin\left(x\right)\cot\left(x\right)=\frac{\sqrt{3}}{2}$
$\left(-21\right)-\left(-35\right)+\left(-60\right)$
$7-x\ge5$
$27m^{3}-\frac{1}{3}b^{9}$
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