$2x\cos\left(x\right)+x$
$x7:x$
$\int\left(\frac{x}{\sqrt{x+7}}\right)dx$
$\log_{x+3}\left(6\right)$
$\left(10x^2-3x^8\right)^2$
$f\left(x\right)=\frac{e^{x\sqrt{x^2+1}}}{e^{2x+1}}$
$\frac{dy}{dx}=\frac{x^3-cos\left(x\right)}{4y}$
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