$\frac{2x+1}{\left(x+1\right)\left(x-3\right)\left(x+2\right)}$
$12x^2-10x-12$
$2x+1\le11$
$\frac{\left(sin^2xcosx+cos^3x\right)}{sinx}=cotx$
$\int\left(\frac{4}{1-\cos\left(\frac{x}{6}\right)}\right)dx$
$3y^2+5y-2$
$x+8\le4$
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