$\cos\:\theta\:\left(\sec\:\theta\:-\cos\:\theta\:\right)$
$3x^3+5xy-2y^2-y^2+6xy+4$
$49x^2-4y^2$
$-2\left(-8-9-10\right)-10\left(-2-1\right)$
$\lim_{x\to1}\left(\frac{e}{e^x-e}-\frac{x}{x-1}\right)$
$\frac{2}{3x}\le-2$
$\int\left(6x^2+4\right)^3xdx$
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