$+4x^2+3x^3-1$
$\frac{2}{x-1}+3=\frac{11}{x-1}$
$\lim_{x\to+7}\left(\frac{2-\sqrt{x-3}}{x^2-49}\right)$
$5x^2-\:15x\:+\:3$
$\frac{dy}{dx}e^{\cosh}$
$\int\frac{cot^{-1}\sqrt{x}}{\sqrt{x}}dx$
$8a^3b^3\:2a-b$
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