$\int\frac{cot\:x}{\sqrt{sen\:x}}dx$

$2-\left(-1\right)+\left(-3\right)-2$

$\lim_{x\to+\infty}\left(\frac{2-y}{\sqrt{7+6y^2}}\right)$

$\sqrt[4]{\sqrt[3]{\sqrt{2xy^3}}}$

$\lim_{x\to0}\left(\frac{x^2+6}{x^2-5x+6}\right)$

$\int\left(2x\cdot\left(x+5\right)^5\right)dx$

$\frac{\tan^2\left(x\right)+\cot^2\left(x\right)+2}{\sec^2\left(x\right).\csc^2\left(x\right)}=1$