$-xy^2\cdot2x^3$
$\lim_{t\to-\infty}\frac{t}{t-5}$
$\left(4\cdot6\right)^2$
$-4\:\left(-8\right)\:\cdot5$
$\arctan\left(x+y+1\right)+c=x+c$
$6n+3+2n$
$2x-2\left(x-3\right)\left(x-3\right)-5\left(x+1\right)^2$
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