$\frac{x^2-x-160}{x^2-25}$

$9x+11=-10+12x$

$2.9-87.23$

$\int\frac{\left(9e^x+6e^{-x}\right)}{\left(9e^x-6e^{-x}\right)}dx$

$\frac{d}{dx}\left(x^2+y^2\right)^6$

$\frac{2+2\sin\left(a\right)}{\cos\left(a\right)+\sin\left(a\right)\cos\left(a\right)}$

$-\left[3x-2x+x\right]+4x-x+\left(2x-x+4x\right)$