$2ay-5cx-5ax+2cy$
$\frac{dy}{dx}\left(1=e^x+e^y+x+2y\right)$
$\frac{2x^3+5x-9}{x-1}$
$tan^4x+tan^2x=sec^4x-sec^2x$
$b^2-10b+21$
$\lim_{x\to\infty}\left(\frac{lnx}{cosx}\right)$
$8a-5b-8a+5b$
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