$6^4\cdot3^4$

$\frac{dy}{dx}=\frac{y\cos\left(3x\right)}{1+2y^2}$

$\left(e^{2y}-y\right)\cos\left(x\right)\frac{dy}{dx}=e^x\sin\left(2x\right)$

$\frac{dy}{dx}=\frac{5y^{2\:}+6xy}{15xy-6x^{2\:}}$

$\sqrt{3}\sec\left(2x\right)-2=0$

$\frac{x^6-x^6}{x^2-y^2}$

$8\left(x-y\right)$