$818-125+48-23$
$\lim_{x\to3.99}\left(\frac{x^2-16}{x+4}\right)$
$\left(x^3-y^3\right)dx_{+3x^2}ydy=0$
$\lim_{x\to\infty}\left(e^{-x}sinx\right)$
$\int e^t\:dx$
$\sqrt{x}\cdot\sqrt[8]{2x}^2$
$3t^2-30t+72$
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