$49^2-36y^2$
$\int_0^x\left(\frac{e^x}{2+3e^x+e^{2x}}\right)dx$
$\frac{d}{dx}\left(x^3\right)+y^3$
$24m^4x-18m^3x+12m^2n^2$
$2x^3-4x^2+4+x^2-2x+2$
$\frac{d}{dx}\left(\frac{6x}{3x^2+7y^2}\right)$
$y=\left(4x-9\right)\left(1-7x\right)$
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