$\frac{dy}{dx}=4\left(1+y^2\right)x^4$

$\frac{\left(x^2+2x\right)}{-x+4}\ge3$

$\frac{d}{dx}\left(3x^2+4\right)^5$

$\frac{3x^2y^3}{-3x^2}$

$2e^{13t}\left(\frac{dy}{dt}\right)-26e^{13t}\left(y\right)=e^{15t}$

$25\left|10\right|-34\left|10\right|$

$\left(5x+36\right)^2$