$a^2-b^2;\:a=3\:,\:b=-2$

$\cos\left(\frac{11\pi}{12}-\frac{3\pi}{4}\right)$

$\lim_{x\to0}\left(\frac{e^{3^x}}{x^2}\right)$

$\left(-8\right)-\left(-15\right)-17-6-8$

$7\cdot3\cdot125$

$\frac{dy}{dx}\left(y=\ln\left(x^2+y^2\right)\right)$

$\int\frac{x^4-1}{x^3-x^2+9x}-9dx$