$8x^2y^3\cdot x^4y^4$

$\left(y+1\right)dy=xdx$

$\int\:\frac{2x^2-1}{6x^3-9x}dx$

$xy\:\frac{dx}{dy}=c$

$\left(2x+2\right)^2$

$\lim_{x\to\infty}\left(x^4e^{-3x}\right)$

$csc\left(\theta\:\right)-cot\left(\theta\:\right)=\frac{sin\left(\theta\:\right)}{1+cos\left(\theta\:\right)}$