$\lim_{x\to\infty}4x\tan\left(\frac{3}{x}\right)$

$\int3x^2\sec^2\left(4x^3-5\right)^2dx$

$\left(12-\left(-4\right)\right)-\left|5-\left(+12\right)\right|$

$\int\frac{\left(1+z^2\right)^2}{z^2}\cdot dz$

$\left(1-\frac{3}{2}\right)^5$

$\frac{dy}{dx}=x^3-x$

$45-\left(-27\right)$