$\lim_{x\to\infty}\left(ln\left(1+x^2\right)-ln\left(1+x\right)\right)$
$\sqrt{x^2+y^2};\:x=3;\:y=-4$
$1+\cot^2\left(\frac{2\pi}{3}\right)$
$\frac{d}{dx}3x^2+2x+xy=4$
$-6x^2-6x-6=0$
$\left(5y^4-12x^3\right)^2$
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