$\sqrt{6}.\sqrt{7}$
$12-3+40-16$
$\ln\:\frac{1+xy}{1-xy}-2x$
$\lim_{x\to0}\left(\frac{3x^2}{tan\left(x^2\right)}\right)$
$3x^3-12x^2-3x$
$\frac{d}{dx}\left(arc\cos\frac{x+1}{3}\right)$
$-36\cdot1$
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