$\left(4x^4+2x^2-2x^3+x+8\right)+\left(7^4+3x-2x^3+x-5\right)$
$36mn-9m$
$\lim_{x\to\infty}\left(\frac{7+x}{x}\right)^{5x}$
$\left(x^3y^5z\right)\left(-9xyz^3\right)^2$
$\lim_{x\to2}\frac{x^2-4}{x^2-2x}$
$cota\:csc^2a\:$
$-100=12t-4$
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