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Let f(x)=|cosx| . Then, f(x) is everywhe...

Let `f(x)=|cosx|` . Then, `f(x)` is everywhere differentiable (b) `f(x)` is everywhere continuous but not differentiable at `x=npi,\ \ n in Z` (c) `f(x)` is everywhere continuous but not differentiable at `x=(2n+1)\ pi/2,\ \ n in Z` (d) none of these

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