$\int_3^4\left(sen\sqrt{x}\right)dx$

$\lim_{x\to-\infty}\:\frac{x^2}{\left(x-11\right)\left(x-5\right)\left(x+1\right)}$

$e^{3y}dy=dx$

$\left(x-1\right)\cdot\left(x-3\right)>0$

$\frac{sin\left(x\right)}{1-sec\left(x\right)}$

$\lim_{n\to\infty}\left(\frac{n}{n^2+1}\right)$

$2^3+36a+54b-2b^3$