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If f(x)=|x-a|varphi(x), where varphi(x) ...

If `f(x)=|x-a|varphi(x),` where `varphi(x)` is continuous function, then (a) `f^(prime)(a^+)=varphi(a)` (b) `f^(prime)(a^-)=-varphi(a)` (c) `f^(prime)(a^+)=f^(prime)(a^-)` (d) none of these

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