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

$\frac{x-1}{2}\le2-x$

$\int\frac{\sin3x}{1-\cos\left(3x\right)}dx$

$\csc\left(e-\frac{3\pi}{2}\right)$

$\lim_{x\to0}\left(1+tan2x\right)^{\frac{4}{x}}$

$706-50x-x^2$

$\left(xz^4\right)^3$