下列函数中，既是偶函数又存在零点的是( ) A．y＝cos x �

下列函数中，既是偶函数又存在零点的是(　　)

A．y＝cos x B．y＝sin x

C．y＝ln x D．y＝x²＋1

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下列函数中，既是偶函数又存在零点的是( ) A．y＝cos x �

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