$$\left(-9ab^2\right)\left(-3ab^3\right)$$

$$\log_{10}\left(x\right)=4.9$$

$$\lim_{t\to.5}\left(3t-3\right)$$

$$5.5^{22}.5^0$$

$$4x^2y^3-8x^3y^4-12x^3y^4$$

$$\frac{e^{\left(x^5+x\right)\sin^2\left(x\right)}}{\sqrt{x^2+1}}$$

$$2x^2=0$$