TeX source:

=\dfrac{1}{T} [(c_m−c_s) p_s t_s − h_s (\dfrac{p^{2}_{s} t^{2}_{s}} {p_m} − p_s t^{2}_{s}) − id_s (T_R + p_s t_s (\dfrac{1}{D_c} −\dfrac{1}{p_m}))−A_s]