$2x-6\left(4x-11\right)$
$f\left(x\right)=\frac{1}{n+1}x^{n+1}$
$\frac{y^2+3y}{x^2+1}$
$x\frac{dy}{dx}+y=e^{-x}$
$\lim_{x\to0}\left(\frac{19}{t^{\frac{1}{19}}}\right)$
$36 x ^ { 6 } + 84 x ^ { 3 } + 49$
$\int\frac{x^3+2x-1}{\left(4x^2+3\right)\left(x^2+4\right)}dx$
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