$19 = 14 + k$
$\frac{2x+y}{x-y}-1$
$\frac{x^2y}{x^2}$
$\left(5x^3y\:-8xy^5\right)\left(5x^3y\:+8xy^5\right)$
$2^2\cdot2^{10}$
$\lim_{x\to\infty}\left(\frac{x-3\sqrt{x}}{\:x-\sqrt{x}}\right)$
$\frac{dy}{dx}=2xe^{-x}$
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