$$\frac{d^3}{dx^3}\left(4\sin\left(2x\right)-4\cos\left(4x\right)\right)$$

$$3x+3x^2+4y+\left(-4\right)+7x+9+9y+x^2$$

$$\frac{dy}{dx}=x^2u$$

$$11a^2b-12ab^2$$

$$-4x-8$$

$$\int_0^{\infty}\left(\frac{10}{e^{5x}}\right)dx$$

$$\frac{1}{y}\frac{dy}{dx}-x^3=0$$