$\int\left(\frac{1}{x^4\sqrt{x^2-1}}\right)dx$

$\frac{d^2}{dx^2}\sqrt{3x^2+1}$

$\left(y+10\right)\left(y-20\right)$

$\frac{0}{infinity}$

$\lim_{3x\to0}\left(\left(\frac{1}{x}-\frac{1}{\senx}\right)\right)$

$\frac{\sec\left(x\right)^2+\sec\left(x\right)}{1+\sec\left(x\right)}$

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