$x^2-3x-9$

$\frac{d}{dx}\frac{\sin\left(5x\right)}{\cos\left(x^2\right)}$

$\int_0^{\infty}\left(\frac{6x}{x^2+1}-\frac{78}{13x+1}\right)dx$

$\left(8x^3y^2z\:-\:3x^2y^4z^5\right)^2$

$\left(1-r\right)^5$

$^{12}\sqrt{\left(2^6\right)}$

$\int\frac{\left(x^2+4x-1\right)}{\left(x^3-x\right)}dx$