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

$\frac{d^4}{dx^4}\left(x^5\right)$

$\lim_{x\to0}\left(\frac{\left(sin\left(3x\right)-3xcos\left(3x\right)\right)}{3x-sin\left(3x\right)}\right)$

$x^2-25x-54$

$3x^2-5x+6\cdot4x-2$

$19\sqrt{2}+\sqrt{2}-20\sqrt{2}$

$\int\left(\frac{\left(x^3+\ln\left(x\right)\right)}{x}\right)dx$