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sinx-cosx=m1+2sinxcosx=m^2sin(2x)= m^2 - 1因為sin(2x)屬於[-1,1]所以m^2 - 1屬於(-無窮大,-1)U(1,+無窮大)m^2>=0,m^2-1>=-1,囙此m^2 - 1屬於(1,+無窮大)m^2屬於(2,+無窮大)m屬於(-無窮大,-根號2)U(根…
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