$\left(-3-5\right)+\left(-12-45\right)$
$25y^2x^2+60yx^2+36x^2$
$\infty-\infty+1$
$3x^2+42xy+9y^2$
$\int\:4r\:e^{3r}dr$
$\lim_{x\to0}\left(\frac{ln99}{x^2}\right)$
$-16-\left(-2\right)^2$
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