$150x^2-150x+2$

$x\frac{dy}{dx}-3y=x^4\sin\left(x\right)$

$x^3dy+y^4dx=0$

$9x^2+12x-6$

$\frac{\left(x^3-y^2\right)^3}{\sqrt[4]{y^2-13}};\:x=2;\:y=7$

$\frac{y'}{y}=e^{3+2x}\left(lny\right)$

$\frac{\sin\left(x\right)}{\sec\left(x\right)^2-1}=\cos\left(x\right)\cot\left(x\right)$