$6,5\cdot7,89\cdot2,2$
$\int\:\frac{x^2+11x-30}{x^3-5x^2+6x}dx$
$\left(x+4\left(x-2\right)\right)$
$\cos^2x-2\cos x=0$
$s6+12\ge9$
$\lim_{x\to-1}\left(\frac{\left|x-1\right|}{x-1}\right)$
$\frac{d}{dx}\left(e^{x^2}+y^2\right)$
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