Find function

Permanent Linkby kabi, Sep 03, 2009, 6:18 am

If f: R - ( - 1 ) \rightarrow R and f is differentiable function satisfies :

f ( x + f(y) + xf(y) ) = y + f(x) + yf(x)

x, y \epsilon R - { ( - 1) } then find f(x)

Solution

You can't change maths but maths can change you( just start loving it)

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