$2\left(-1\right)^3+4\left(-1\right)^2+\left(-1\right)+2$
$\left(-6\right)-\left(-9\right)+\left(+13\right)$
$\frac{1}{2}\left(\cot\left(x\right)+\tan\left(x\right)\right)=\csc2x$
$2y-2$
$x\left(x+2\right)\left(x-2\right)$
$\left(\frac{73}{129}\right)-7.0207$
$-15-30+6-10$
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