$$\lim_{x\to0}\left(\frac{1-\cos\left(2x\right)}{2x^2}\right)$$

$$3x^2-2x\ge2x^2+15$$

$$-612:-629$$

$$4t+2t^2+t+t^2$$

$$3-6a+12b$$

$$\lim_{x\to\infty}\left(\frac{\sqrt{10x^4+x^2+20}}{15x^2+33}\right)$$

$$300\cdot65$$