$$\left(90-2y-3z\right)^2$$

$$\frac{\left(-2x^4y^2\right)^{-1}}{2y^2}$$

$$\int\cos^{19}\theta\:\sin\theta\:d\theta\:$$

$$36x^2+20x\:+100$$

$$\int_{\pi}^{2\pi}\left(\cos\infty\right)dx$$

$$7\cdot5+8-4+6$$

$$x^2-25<0$$