$\frac{dy}{dx}y=2$
$\lim_{x\to4}\left(\frac{x^2-x-20}{x^2-16}\right)$
$\frac{5-12x}{\left(1+6x\right)\left(4+3x\right)}$
$729x^9+27$
$25x^2y^3+55xy^3$
$\frac{1-sin^2\left(x\right)}{sin^2\left(x\right)}+sin^2\left(x\right)$
$2\left(5j+9\right)+5j$
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