$\frac{1}{x}<-8$
$\lim_{x\to1}\left(\frac{sen\left(1+y\right)}{\left(1+y\right)}\right)$
$\left(3x^3+3\right)$
$\frac{\sec\left(x\right)}{1-\sin\left(x\right)}$
$\lim_{x\to0}\left(\frac{\cos\left(8x\right)}{sin\left(7x\right)}\right)$
$\:9\:-\:7\:-\:2\:-\:6\:+\:4$
$\int\frac{3x^2-x+1}{\left(x^2+1\right)\left(x-1\right)}dx$
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