$$x^2+5+4$$

$$\lim_{x\to0}\left(\frac{sin4x}{2x}\right)$$

$$\frac{d^2}{dx^2}\left(x^2+\frac{1}{4}x^5+2x\right)$$

$$\int_1^{x^2}\left(\cos\left(u\right)\right)du$$

$$\frac{dy}{dx}=xy^2\ln\left(x\right)$$

$$\left(a+1\right)\left(a-1\right)-2a+b$$

$$\frac{16x+12}{2x+3}$$