$\frac{dy}{dx}=1+y+x^2+yx^2$
$4x^2-8x+320$
$3b\left(2b^2-b+8ab-a\right)+a$
$\frac{z^2+5z-12}{z-3}$
$\tan2\:a-\sec2\:a$
$38x^2+25x-250$
$13\left(3\:+\:2\right)\:+\:0\left(12\:+\:8\right)$
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