$$\int_0^{\infty}\left(\frac{45}{1+x^2}\right)dx$$

$$\sqrt[4]{16a^8b^4}$$

$$\lim_{x\to\infty}\left(\frac{4x+8}{3x^2-3x-5}\right)$$

$$sinx-tanycosx\:=\:\frac{sin\left(x-y\right)}{cosy}$$

$$6x+2-1-4x-3-2x+2$$

$$\frac{x^2-3x+2}{x-5}$$

$$4\sec^2x-8=0$$