Let f: R to R be a one - one onto di...

Let ` f: R to R ` be a one - one onto differentiable function, such that `f (2) = 1 and f' (2) = 3 ` . Then find the value of ` (( d)/( dx) ( f^(-1) ( x) ) )_(x = 1)`

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The correct Answer is:

` (1)/( sqrt( a^(2) + x^(2)))`

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