$2x^2+16x=0$
$\frac{dy}{dx}=xe-y$
$\frac{1}{1-\:sinx}-\frac{sinx}{1+sin\:x}$
$secx:senxtanx+cosx$
$25m^4-25$
$u^2-4u+4$
$\frac{x^4+2x^3-1}{x^2}$
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