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If f is a real valued function, not iden...

If f is a real valued function, not identically zeroand satisfying` f(x_1 + x_2)) + f(x_1 - x_2) = 2 f(x_1)f(x_2)forall x_1,x_2`, then` f(x)` is (1) An odd function(2) An even function (3) Neither even nor odd(4) f(0) = 1/2

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