\[ \text{This is a block of LaTeX code} \; e^{i\pi} = -1\]
\[ e^{-i\pi} = -1\]
\[ \mathbf{J}_{1,2} = \left[ I_{1,2} \dot{\Omega}_{orb} + \Omega_{orb} \dot{M}_{1,2} \left( \frac{\partial I_{1,2}}{\partial M_{1,2}} \right)_{J_{1,2}} \right] \beta_{1,2}\]