$\lim_{x\to0}\left(\frac{ln\left(cos\:x\right)}{x^{-1}}\right)$
$\frac{1}{6}a+2$
$6x\left(-3\right)+\left(-2\right)\left(-4\right)$
$\int-\frac{1}{2}xsen\left(2x\right)e^{-3x}dx$
$\lim_{x\to0}\left(\frac{x^4+4x^3+3x^2-7x}{x^2-4x+6}\right)$
$y'=2y-y^2$
$\frac{dx}{dt}=\frac{36t^2}{x}$
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