$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)\sin\left(4x\right)}{x^2\cos\left(x\right)}\right)$
$-0-\left(-8\right)-7$
$\left(\left(x-2y\right)+7z\right)^2$
$x^4-2x^3-15x^2+28x-7\::\:2x^2-4x+3$
$\int\frac{5x+9}{\left(x+1\right)^2}dx$
$7\cdot157$
$3m^3y^3-5a^2x^4:-3x^2$
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