$x\left(y\right)^3y^2+\left(x\left(y\right)^2y^3-\frac{1}{1-9x\left(y\right)^2}\right)x'\left(y\right)=0$

$-3\:+\:2\:-\:-1$

$\frac{x^4-2x^2-1}{x^2-2}$

$\sqrt{\left(\frac{\left(6x+3\right)}{x-2}\right)}$

$\frac{d}{dx}\sqrt{3x+7}=9+x^2y^2$

$-\left(-8\right)^2+4\left(-8\right)+5$

$\left(2^5-3^2\right)+6^2$