TeX source:

=nc_rI_p[\dfrac{T_RD_R+D_cM^2−2MD_R}{2}]+c_rI_p[\dfrac{(p_mT_s−nD_R)^2}{2D_c} \\ +(p_mT_s−nD_R)M+\dfrac{D_cM^2}{2}]