$\frac{\sin\left(2x\right)}{2\cot\left(x\right)}$
$x^2-1^2$
$2\left(-1\right)^2+5\left(-1\right)-3$
$\lim_{x\to0}\:2^x$
$3\tan^2\left(x\right)+4=5$
$\left(s+t\right)\left(t+s\right)\left(s+t\right)$
$\sqrt[3]{\frac{y}{2}}\:$
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