$$x^4-30x^2+50x$$

$$\sqrt{9-4\left(4\right)\left(-2\right)}$$

$$3\sec x+13\sec x+14$$

$$x^2\:-\:x\:+\:3\:=\:5$$

$$\int\left(\frac{\left(1+e^2\right)}{\left(1-e^2\right)}\right)dx$$

$$\left(3x\cdot5\right)\left(4x\cdot9\right)$$

$$\frac{1}{4\cos\left(x\right)^2+9\sin\left(x\right)^2}$$