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Estimate the ground state energy of helium atom by taking the product of two normalized hydrogenic ground state wave functions as the trial wave function,

 Estimate the ground state energy of helium atom by taking the product of two normalized hydrogenic ground state wave functions as the trial wave function, the nuclear
charge Ze being the variable parameter. Assume that the expectation value of the interelectronic repulsion term is (5/4) ZWH, WH = 13.6 eV.

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