$3\sqrt{3}+18\sqrt{3}-7\sqrt{3}$

$26-8z=2$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{cos\left(5x\right)}{1-sin\left(x\right)}\right)$

$\frac{4x+6}{x}$

$\frac{dy}{dx}+y=e^{-3x}\cos\left(2x\right)$

$\left(3+x^2\right).\left(x-3x^8-x^2\right)$

$\lim_{x\to\infty\:}\left(\:\frac{3x-4}{3x+2}\right)^{3x+1}$