$\frac{a^2}{36}-\frac{x^2}{25}$
$\left|-5\right|+9$
$\lim_{x\to0}\left(\frac{1+\cos\left(x\right)}{1-senx}\right)$
$\int x\sec^{2}10xdx$
$2x^2-8x=-14$
$\left(x^4-3x^3y+2x^2y^2+xy^3\right)\cdot\left(-x^2-xy-y^2\right)$
$\frac{d^2}{dx^2}\left(18x^3-32x^2\right)$
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