$\frac{4x^2+6x}{2x}$
$\frac{d^{15}}{dx^{15}}\left(\sin\left(3x\right)+\cos\left(x\right)\right)$
$\lim_{x\to0}\left(lnx\right)^x$
$\frac{6}{7}+\left(_-\frac{5}{14}\right)$
$a^2+b^2=44$
$\int\sqrt{x}\cdot\left(7x^2+x\right)\cdot dx$
$81m^4n^4-72m^2n^2+16n^2$
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