Test LaTex 1. $$I = \int\limits_{ - \infty }^\infty {{e^{ - {x^2}}}dx}$$ With dollar signs 2. $I = \int\limits_{ - \infty }^\infty {{e^{ - {x^2}}}dx} $ With backticks 3. ` $$I = \int\limits_{ - \infty }^\infty {{e^{ - {x^2}}}dx}$$ ` on