$$\int\frac{x^3+x^2+x-2}{x^2\left(x^2+1\right)}dx$$

$$\:\left(13ab^3-4\right)\left(13ab^3+4\right)$$

$$1.4x+2=51-3.5x$$

$$\frac{16}{25}+cos^2=1$$

$$\left(csc2x\:-\:1\right)secx$$

$$\int r^2\left(r^3+8\right)^3dr$$

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