Q 1305891768.     Which of the following function is differentiable at `x=0` ?

A

`cos(|x|)+|x|`

B

`cos(|x|)-|x|`

C

`sin(|x|)+|x|`

D

`sin(|x|)-|x|`

HINT

`L f'(0) =R f'(0)`
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