$2t\left(1-t\right)+2t^2$
$\frac{d^2}{dx^2}\left(x\cdot y\right)$
$349+85$
$ydy=7xdx$
$\left(x^n-3\right)\left(x^n+12\right)$
$\frac{\left(a+6\right)\left(a-6\right)+36}{a^{2}}$
$6x+1+7x$
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