求解 I _ { 1 } = ∫ (from 0 to infty) of int_0^inftye^-x^2e^-4^2 wrt xdy

$$I _ { 1 } = \int _ { 0 } ^ { \infty } \int _ { 0 } ^ { \infty } e ^ { - x ^ { 2 } } e ^ { - 4 ^ { 2 } } d x d y$$

求解 I_1 的值

$$I_{1}=\int _{0}^{\infty}\int _{0}^{\infty}e^{-x^{2}-16}\mathrm{d}x\mathrm{d}y$$

赋予值 I_1

$$I_{1}≔\int _{0}^{\infty}\int _{0}^{\infty}e^{-x^{2}-16}\mathrm{d}x\mathrm{d}y$$