First Friedmann equation in density parameters: $H^2/H_0^2 = \Omega_{0,R}a^{-4} + \Omega_{0,M}a^{-3} + \Omega_{0,k}a^{-2} + \Omega_{0,\Lambda}$

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First Friedmann equation in density parameters: $H^2/H_0^2 = \Omega_{0,R}a^{-4} + \Omega_{0,M}a^{-3} + \Omega_{0,k}a^{-2} + \Omega_{0,\Lambda}$ · Prove2Me