$\frac{d^3}{dx^3}\left(x\cdot e^{-x}\right)$
$\frac { 2 x ^ { 4 } - 5 x ^ { 3 } + 3 } { 2 x ^ { 2 } - 2 x }$
$\frac{7^4}{7^{-3}}$
$-\left(+4-6\right)+\left(-12+1\right)-5-\left(+4-19\right)-13$
$1+csc^2x$
$3\left(-5\right)^2-33\left(-5\right)+90$
$\lim_{t\to0}\left(\frac{\cos\left(t\right)-1}{\sin\left(t\right)}\right)$
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