The functionf(x)=|2sgn(2x)|+2 is (where sgn(x) means signum x)

Question

The function

f (x) = | 2 sgn (2 x) | + 2

is (where

sgn (x)

means signum

x

)

differentiable at

x = 0

discontinuous at

x = 0

continuous at

x = 0

none of these

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