Question: The function f ( x ) = | cos ( x ) | is differentiable everywhere on the interval ( 0 , 5/4 ) except

The function f ( x ) = | cos ( x ) | is differentiable everywhere on the interval ( 0 , 5/4 ) except at which value of x?

A. x=1/8

B.x=1/4

C.x=1/2

D. x=3.4

E. x=1

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