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问题 选择题

曲线f（x）=2cosx+3在点（0，5）处的切线方程为（　　）

A．x-5=0

B．y-5=0

C．x-3=0

D．y-3=0

答案

求导得：f′（x）=-2sinx，

把x=0代入导函数得：f′（0）=0，所以切线方程的斜率k=0，

则切线方程为：y-5=0，

故选B．

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