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The number of points at which the functi...

The number of points at which the function,
`f (x)={{:(min {|x|"," x ^(2)}),(min (2x -1"," x^(2)}):}if x in (-oo,1)` otherwise is not differentiable is:

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  12. Let f be a differentiable function satisfying f(x/y)=f(x)-f(y) f...

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