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Let f : R to R be defined by f (x + y) =...

Let `f : R to R` be defined by `f (x + y) = f (x) - f (y) + 2xy + 1 AA x, y in R . If f (x)` is differentiable every where and `f '(0) =1,` find `f '(x).`

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The correct Answer is:
`2x - 1`
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AAKASH SERIES-DIFFERENTIATION -ADVANCED SUBJECTIVE TYPE QUESTIONS
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  14. If f (x) has a derivative at x =a then find Lt (x to a) (x f (a) - a f...

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