24. 設函數 f (x) = sin | x |,則下列敘述何者正確?
(A)(x) 在 x = −π的導數 f ′(−π) = −1
(B)f (x) 在 x = π的導數 f ′(π) = −1
(C)f (x)  在 x = 0的導數 f ′(0) = 1
(D)f (x) 在 x = 0的導數 f ′(0) = −1

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統計: A(0), B(1), C(1), D(0), E(0) #2996866

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