Merge pull request #191 from geoscixyz/emdata-patch-6

Update electromagnetic_data.rst

Author: lheagy

content/electromagnetics/electromagnetic_data.rst

@@ -117,7 +117,7 @@ The secondary field is :math:`H_s \cos(\omega t + \psi)` and can be written
 as
 
 .. math::
-        H_s \cos(\omega t + \psi) &= H_s { \cos(\omega t) \cos(\psi) - \sin(\omega t)\\ \sin(\psi)   }\
+        H_s \cos(\omega t + \psi) &= H_s [ \cos(\omega t) \cos(\psi) - \sin(\omega t) \sin(\psi) ] 
                                   &= [H_s \cos(\psi)] \cos(\omega t)  - [H_s \sin(\psi)] \sin(\omega t)
 
 The first term has the same phase as the primary field and is referred to as