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We prove that the values of the electroweak mixing angle $\sin^2\theta_W$ andintermediate mass scale $M_I$ have vanishing contributions due to one-loop,two-loop and gravitational corrections in Grand Unified Theories whichaccommodate an intermediate trinification symmetry ($G_{333D}$) invoked withspontaneous D-parity mechanism operative at mass scale greater than $M_I$. Theproof of theorem is robust and we verify the results numerically usingsupersymmetric as well as non-supersymmetric version of $E_6$-GUT.

Theorem on vanishing contributions to $\sin^2\theta_W$ and intermediate mass scale in Grand Unified Theories with trinification symmetry