I want to change the colour of part of a formula. Like,
V_I^2 ~=~ {alignc 2 lbrace p_E - p_S ~-~ g[%rho_{1}(z_S - z_E) ~-~ {%rho_1} over {2} (V_S^2 ~-~ V_E^2)] rbrace} over {alignc %rho_1 D_1^4 sum from{i = 1} to {N} f_i {alignc L_i} over {D_i^5} }
How do I do this? I cannot see how.
Thanks.