$1,4,7,10\:sequence$

$\lim_{y\to0}\left(\frac{sen\left(1-cosy\right)}{y^2}\right)$

$2x=5x+18$

$\lim_{x\to2.01}\left(\frac{x^2-5x+6}{x-2}\right)$

$\lim_{x\to0}\left(\frac{\left(e\right)^x-1+\ln\left(1-x\right)}{\tan\left(x\right)-x}\right)$

$abc-2\left(a-b+c\right)$

$\int\:\frac{x+6}{\left(x+3\right)\left(x+5\right)}dx$