$\log_x\left(x\right)$

$\left(2\cdot a+b\right)^3$

$\left(51x^3+70x^2+97x+90\right)\left(3x+2\right)$

$\left(3x^3-2x^2y^4+2x\right)+\left(4x^4+2x^3+2x^2y^4\right)$

$\left(2a+b-c\right)^2-\left(a+b\right)^2$

$\frac{24a^2}{6a^2-9a}$

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