$\lim_{x\to0}\left(\frac{1+sen\left(x-e^x\right)}{\left(arctg\left(x\right)\right)^2}\right)$

$9+x^2-2x$

$\sqrt{\frac{\left(x-2\right)}{x^6+2}}$

$\frac{csc\left(-31.5\right)}{\sqrt{csc\left(-31.5\right)^2-1}}$

$\frac{2}{x-4}<1$

$\int\left(x\right)^3\left(x^4+5\right)^3dx$

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