$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{x^4}\right)$
$\frac{x^{-7}}{x^{-4}}$
$\left(x\:+\:1\right)^2\:-\:\left(x\:+\:1\right)\left(x\:-\:1\right)\:-\:2$
$3x^4-9x^3+6x$
$3^4.\left(3^2\right)\left(3^8\right)\:$
$=\frac{x^{2}-3}{x^{2}+2}$
$53,45+87,2$
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