單項(xiàng)選擇題函數(shù)z=(1+ey)cosx-yey的極值點(diǎn)情況是()

A.無(wú)極值點(diǎn)
B.有有限個(gè)極值點(diǎn)
C.有無(wú)窮多個(gè)極大值點(diǎn)
D.有無(wú)窮多個(gè)極小值點(diǎn)


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