$1-2a+2a^2$
$x^3\:\frac{dy}{dx}=yx^5+4x^2y$
$=3x^2-5x+4$
$-1+-1+15$
$\lim_{x\to0}\left(\frac{\cos^2\left(x\right)}{-x^2}\right)$
$3+sec^2x$
$\left(2x+3\right)\left(2x^2+3x\right)$
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