$\lim_{x\to0}\left(\frac{x+e^x-1}{xe^x+x}\right)$
$b^2=\sqrt{a^2-2ax+x^2+h^2}$
$sec41\cdot\:\:sec4\cdot\:\left(cos37+sec45\cdot\:\:sen30\right)$
$4\left(2x-6\right)$
$4-3x^2\:-9x\:-7\:+x^2$
$-7\:-\:1$
$\sqrt[4]{\left(x+y\right)^3}.\sqrt[12]{\left(x+y\right)^{-1}}.\sqrt[3]{\left(x+y\right)^4}$
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