$\frac{af}{ax};\:\frac{af}{ay}\:z=x^4sin\left(xy^3\right)$

$\int\left(\frac{1}{\sqrt{7-6x-x^2}}\right)dx$

$\frac{dr}{d\theta}+r\tan\theta=9\sec\theta$

$\frac{\left(x-1\right)}{3x+6}$

$2x\:+\:4\:=\:5x\:-\:11$

$\left(4x^2-10\right)\left(4x^2+10\right)$

$\frac{\csc\left(\theta\right)}{sec\left(\theta\right)}+\frac{cos\left(\theta\right)}{sin\left(\theta\right)}=\frac{x}{tan\left(\theta\right)}$