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A non-zero function f (x) is symmetrical...

A non-zero function f (x) is symmetrical about the line `y=x` then the value of `lambda` (constant) such that `f^2(x)=(f^-1(x))^2-lambdaxf(x)f^-1(x)+3x^2f(x)` where all x`in R^+`

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