$$3.\sqrt[3]{x}=6$$

$$\int6xsin\left(3x\right)dx$$

$$60\left\{\frac{1}{4}+\frac{2}{3}\right\}$$

$$x^2+20x+100=0$$

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

$$\left(-7x^4+6x^2+6x+5\right)-\left(9x^4\right)$$

$$\frac{dy}{2dx}=\frac{2x}{3y}$$