$$\int\left(4\sqrt{4-x^2}\right)dx$$

$$\int\frac{x^2-1}{\left(x^2+2x+1\right)^2}dx$$

$$\frac{dy}{dt}=-2y+cos\left(3t\right)$$

$$\frac{b^7}{b^4}$$

$$\frac{3}{4}\:=\:\frac{1}{4}\:x$$

$$4m^2+65m=5m$$

$$\left(x-y-z\right)\left(-x-y-z\right)$$