$\frac{dy}{dx}\left(ln\left(x^2+y^2\right)\right)$

$\frac{dy}{dx}=8x+7y$

$\lim_{x\to0}\left(\frac{3x^2}{\sin\left(2x\right)\cdot\sin\left(4x\right)\cdot\sin\left(3x\right)}\right)$

$x^6+y^6=0$

$\int\frac{\sqrt{\left(36-y^2\right)}}{4}dy$

$x^2y\:+\:2xy\:=\:ln\left(x\right)\:$

$\sqrt{9a^2b^2c}$