$3\cdot\left[5\cdot\left(-3\right)+25\right]-\left(10-18\right)$

$\frac{\frac{d^3}{dx^3}\left(x^3-3x+6\right)}{3}$

$y\ln\left(x\right)\frac{dy}{dx}=\frac{y-1}{x}$

$\frac{x^2+8x-12}{x-5}$

$\lim_{x\to0}\left(\frac{1-cos\left(sinx\right)}{x^2cotx}\right)$

$2\cos^2\left(x\right)-\cos\left(2x\right)$

$8ab^2-4a^2b+4a^2b^2$