$$12\cdot\tan^2\left(x\right)-8\sec^2\left(x\right)-\frac{3}{\cot\left(x\right)}+10$$

$$\lim_{x\to0}\left(\frac{\sin\left(x\right)-\tan\left(x\right)}{\sin\left(x\right)}\right)$$

$$\left(x+1\right)^2-\left(x-1\right)^2+12\:>0$$

$$-4.\:8\::\:16\:+\:16\::\:-4\:-\:4\::\:-2\:\cdot9$$

$$y=3x^{-2x}$$

$$\left(-8+3\cdot7\right)-\left(44-\left(-6\right)+5\cdot\left(-9\right)\right)$$

$$cscx-tan\frac{x}{2}=-cotx$$