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If f(x+y)=f(x)+f(y)+2xy-1quad AA x,y in ...

If `f(x+y)=f(x)+f(y)+2xy-1quad AA x,y in R` and `f` is a polynomial function and `f'(0)=3` ,then the number of points of non-differentiability for `y=|f(x)-1|-1|` are

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