$\lim_{x\to0}\left(\frac{te^t}{1-e^t}\right)$
$\left(1-\sen^{2}x\right)\tan x-\senx\cos x$
$\sqrt{34+15}$
$4a^3b-2a^2b^2-1.11ab^3$
$9x^4-25y^2$
$\sqrt[a+1]{x^{-1}}\sqrt[a]{x}\sqrt[a+1]{x}$
$7z+15+2$
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