$3x^2y-7xy^2+6x^2y+4xy^2$
$\frac{x^4-x^3-2x}{x+3}$
$\sqrt{a^2-b}.\sqrt{a^2-b}$
$-4\cdot5+-2+-48+-4-3200$
$2x^{3\:}+3x^{2\:}-\:18x\:-\:27$
$\lim_{x\to0\:}\:\left(\frac{e^x}{e^x+xe^x}\right)$
$\int\left(x^3-2x^2\right)\ln\left(x\right)dx$
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