$\int\left(\frac{\sqrt{y^2+4}}{y^2}\right)dx$

$3-5\cdot4$

$\int3z^2dz$

$\lim_{x\to0}\left(\frac{3sinx}{\sqrt{-x}}\right)$

$\int x\cdot25\cdot e^{\left(-\frac{1}{25}\cdot x\right)}$

$\lim_{x\to0}\left(\left(\frac{5}{2+\sqrt{x+9}}\right)^{\frac{1}{\sin\left(x\right)}}\right)$

$\int x\:csc\:^25x\:dx$