$\frac{dy}{dx}=x^2y\:y\left(1\right)=e$
$\left(1.4n^5-4\right)\left(1+1.4n^5\right)$
$\left(61+23\right)-\left(15+17\right)$
$a^2-2ab,\:a=2\:i\:b=1$
$13-\left(-21\right)$
$\left(2x+7\right)\left(2x-5\:\right)$
$x^2-y^4$
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