Find the value of ( a^2 + a^2 - 1 )^4 + ( a^2 - a^2 - 1 )^4 - Vidyadip

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Find the value of ${({a^2} + \sqrt {{a^2} - 1} )^4} + {({a^2} - \sqrt {{a^2} - 1} )^4}$

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