$\int\left(\frac{1}{z\cdot\sqrt{4\cdot z^2+9}}\right)dz$

$x4+4x^2y^3-3x^3+4xy^5$

$\csc\left(y\right)dx=-\sec\left(x^2\right)dy$

$x^2y+x^2z$

$\lim_{x\to2}\left(\left(x+1\right)^2\right)$

$\int\sqrt{-x^2+6x-8}dx$

$\frac{x^3y^{15}+z^{12}}{xy^5+z^4}$