$$\frac{t-1}{t^4+6t^3+9t^2}$$

$$\frac{dy}{dt}=10$$

$$\lim_{x\to2}\left(\frac{1}{\left(x-2\right)^{\frac{2}{3}}}\right)$$

$$\left(5a^3+b\right)\left(5a^3-b\right)$$

$$\left(4x\right)\cdot\left(2x\right)$$

$$5x\:+\:3x\:+\:5\:\:3$$

$$\lim_{x\to\infty}\left(\frac{ln\left(x^4+2\right)}{7x+4}\right)$$