$\frac{2x^2}{3+x^2}$
$\left(3x+2\right)\left(2x-4\right)-3x\left(2x-5\right)$
$x^3\frac{dy}{dx}+3x^3y=x$
$\left(a^6b^4c^2-1\right)$
$-am+6mn-45\:-am-5mb+65\:+3am-25$
$f\left(x\right)=x^3+x$
$\sin^2\left(x\right)+\sin^2\left(x\right)\cot\left(x\right)=1$
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