$\frac{7-2x}{\left(4+x\right)\left(3x-2\right)}$

$\lim\:_{x\to\:o}\left(\frac{xcosx-senx}{x^3}\right)$

$123.000\:+12.670\:$

$log\left(x\right)\:+\:log\left(100y\right)\:=\:2$

$\int\frac{x\left[ln\left(1+x^2\right)^2\right]}{1+x^2}dx$

$\int\left(\left(2x+3\right)^3\right)dx$

$3n^2-4-10n+n^2$