$$\lim_{x\to\infty}\left(\frac{1+e^{-3x}}{9+5x^2}\right)$$

$$\int_{\sqrt{2}}^{x^3}dy$$

$$5=\left(3x+7\right)\left(2x^2y^4-7\right)$$

$$\frac{\left[3\cdot2^5-13\cdot\left(-2\right)\right]+2^3}{\left(-2^2+3^2\right)-3}$$

$$0.5x^2\left(x^3-8x^2-1\right)$$

$$4^2-4^3$$