$cos\left(arccos\:2x-arctan\:x\right)$
$\frac{x^3+4x^2-3x-18}{x-4}$
$x^4-7x^2+6x$
$\ln\left(x-49\right)-ln\left(x+49\right)=-\frac{2}{5}$
$\frac{6x^2-25x+21}{x+3}$
$\lim_{x\to4}\left(\frac{3-\sqrt{5+x}}{3-\sqrt{5-x}}\right)$
$\int10ae^ada$
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