$\int cos\left(a\right)da$
$9x-6\ge-18x-1$
$\frac{x^2+2x+x^2-2}{x^2+1}$
$x-\frac{29x-56}{\left(3x-7\right)\left(2x-3\right)}$
$\frac{d}{dx}\:\sqrt{100-x^2}$
$\frac{-2x^7-4x^3-2x^2-3x-2}{x-1}$
$\int\sqrt{1+a}da$
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