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If f(x) = x + tanx and g(x) is inverse o...

If `f(x) = x + tanx and g(x)` is inverse of `f(x)` then `g'(x)` is equal to (1) `1/(1+(g(x)-x)^2)` (2) `1/(1-(g(x)-x)^2)` (3) `1/(2+(g(x)-x)^2)` (4) `1/(2-(g(x)-x)^2)`

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