$$6x^2-24=0$$

$$\frac{2}{5x}-2\le-\:0$$

$$4\cos^2\left(x\right)-\tan^2\left(x\right)=0$$

$$\frac{1}{4}\int\left(\sin\left(x\right)^{-2}\cdot\cos\left(x\right)\right)dx$$

$$x\:+2y\:-z=2$$

$$9n^2+n^3+18n$$

$$\lim_{t\to1}\left(\frac{\sqrt{t}}{t^2+t-2}\right)$$