TeX source:

\dfrac{1}{T}[c_{r1}p_mT_s−c_rp_mT_s−\dfrac{h_r}{2}(\dfrac{p^{2}_{m}T^{2}_{s}}{D_c}−2np_mT_sT_R−(2n+1)T_RD_R) \\ +\dfrac{(n+1)c_{r1}i_eD_cM^2}{2}−\dfrac{n_{cr}I_p}{2}[T_RD_R+D_cM^2−2MD_R]−id_rT_R−A_r \\ +(p_mT_s−nD_R)M+\dfrac{D_cM^2}{2})−c_rI_p(\dfrac{(p_mT_s−nDR)^2}{2D_c}]