已知函數f(x)=2sin(wx+φ)(w>0,-π/2

已知函數f(x)=2sin(wx+φ)(w>0,-π/2

由已知可得,T/2=7π/8-3π/8=π/2,所以T=π=2π/w,則w=2.當f(3π/8)=2sin(3π/4+φ)=2,必有f(7π/8)=2sin(7π/4+φ)=-2sin(3π/4+φ)=-2,二式完全等價囙此,只能確實,f(3π/8)=2sin(3π/4+φ)是極值點,但不能確實是…