$$9x^2+2x-1\ge0$$

$$\frac{sen^2\left(x\right)+1}{x^2}$$

$$\left(4f\:\:+\:\:5g\right)^2$$

$$\lim_{x\to\infty}\left(\frac{2^{1.4x}}{3\cdot e^x}\right)$$

$$\frac{2^7}{2^5}$$

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

$$\left(\frac{11}{6}+12\right)^2$$