$a^3+a^2+ax$
$f\left(x\right)=\left(x+3\right)\left(x-2\right)\left(x-5\right)$
$\left(x+6\right)^2\le0$
$\lim_{x\to0}\left(\frac{\cos\left(4x\right)-\cos^2\left(2x\right)}{x}\right)$
$327\cdot10$
$\int\frac{21x-19}{x^2-5x+4}dx$
$\frac{dy}{dx}2\sin x\cos x=1$
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