$$\int\left(\frac{-7x^4+5x^3-8}{x^4}\right)dx$$

$$f\left(x\right)=6x^2+3x$$

$$\frac{-x^4-x^2+7}{x^3+x^2+4x+4}$$

$$\int\frac{5}{x^2\sqrt{25-x^2}}dx$$

$$\frac{\left(2sin\left(\frac{8x}{2}\right)cos\left(\frac{6x}{2}\right)\right)}{\left(-2sin\left(\frac{8x}{2}\right)sin\left(\frac{6x}{2}\right)\right)}$$

$$lnx+lny=\pi$$