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For which of the following functions f(0...

For which of the following functions `f(0)` exists such that `f(x)` is continuous at x=0 `f(x)=1/((log)_e|x|)` b. `f(x)=(cos((sin|x|)/x))` c. `f(x)=x sin(pi/x)` d. `f(x)=1/(1+2^(cot x))`

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