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The function f is not defined for x = 0, but for all non zero real numbers x, f(x) + 2f (1/x) =3x

The equation f(x) = f(– x) is satisfied by 

(A) exactly one real number 

(B) exactly two real number 

(C) no real numbers. 

(D) all non zero real numbers

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Correct Option:- (B) exactly two real number

Explanation :- 

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