$\lim_{x\to0}\left(\frac{4x}{tanx}-cosx\right)$
$3x^2-17x-120$
$\frac{-5}{7}\left(\frac{50}{5}-\frac{1}{5}\right)$
$-x+x^2-3x^2$
$\frac{dx}{dt}=\frac{x}{t-1}$
$\int_{-1}^1\left(x^{\left(-\frac{2}{3}\right)}\right)dx$
$\int\frac{1}{e^{2x+3}}dx$
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