$\frac { 1 } { 3 x ^ { 2 } + x }$
$\sqrt{\sqrt[42]{3.1416}}$
$x+1=3x-3$
$\int\frac{x-\arccot\left(2x\right)}{1+4x^2}dx$
$\int\frac{x^2}{\left(16-x^2\right)^2}dx$
$\frac{d}{dx}-2x^4-6$
$\left(5\sqrt{2+2}\right)^2+\left(5\sqrt{2-2}\right)^2$
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