$-x\cdot\frac{\left(3x^4\right)^4}{2x}$
$\left(\sqrt{1+x^2}+ny\right)dx+\left(\sqrt{1+y^2}+nx\right)dy=0$
$8\:\cdot\:\left(-1\right)\:\cdot\left(-2\right)\:\cdot\:5$
$4ax^2+4bx^2-2ay^2-2by^2$
$\frac{36x^4-109x^2+25}{3x-5}$
$10xy-5z-9xy+4z+2$
$\frac{dy}{dx}=\frac{x+3}{y^2}$
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