$-\frac{3}{4}\:-\frac{1}{4}$

$\lim_{x\to0}\left(\frac{9x-3\sin\left(3x\right)}{5x^2}\right)$

$\frac{x-9}{5}-\frac{x-4}{15}\le\frac{1-2x}{3}$

$\frac{dy}{dx}+y\cos\left(x\right)=4\cos\left(x\right)$

$\frac{3x^2+7x+2}{x+2}$

$180^o-tan^{-1}\left(\frac{3}{1}\right)$

$\lim_{x\to\infty}\:\left(1+\frac{11}{x}\right)^{\frac{x}{6}}$