$$\frac{1}{2}x^2\cdot\frac{4}{5}x^3y$$

$$\left(52e^8+16f^3\right)$$

$$2\frac{dy}{dx}\:+y=4$$

$$\frac{dy}{dx}+y\cdot x=\frac{1}{x}$$

$$\lim_{x\to\pi}-\left(\left(x-\pi\right)cscx\right)$$

$$\:4x^2-20x=0$$

$$\left(3m+n^2\right)-\left(5x^3\right)^2$$