$\int\frac{1+x^4}{x\left(x^2-1\right)}dx$
$\frac{12x}{x+3}>x+3$
$x=\frac{\sqrt{x\sqrt{x\sqrt{x\sqrt{x}}}}}{\sqrt{\sqrt{\sqrt{\sqrt{x^{-1}}}}}}$
$8x^2+26x+15$
$\int\frac{2x-1}{\left(x^2+1\right)^2}dx$
$\lim_{x\to0}\:sen\:5x\:cos2x$
$\left(4xy-2y\right)^3$
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