The discussion centers on understanding the origin of the cos(theta) term in the formula for dE from Griffith's Electrodynamics. It is clarified that when adding the r_hat vectors, the result simplifies to 2(z/r)z_hat, where z/r is equivalent to cos(theta). Participants express concern about the complexity of deriving this formula independently. However, it is emphasized that the formula is provided in a general form, alleviating the need for self-derivation. The conversation highlights the importance of grasping the underlying concepts in electrostatics.
