sin(x－45°)＝-5/13,sin2x
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sin(x－45°)＝-5/13,sin2xsin(x－45°)＝-5/13,sin2xsin(x－45°)＝-5/13,sin2xcos2(x-45°)=cos(2x-90°)=-sin2x=1-2
sin(x－45°)＝-5/13,sin2x
sin(x－45°)＝-5/13,sin2x
sin(x－45°)＝-5/13,sin2x
cos2(x-45°) =cos(2x-90°) =-sin2x =1-2sin(x-45°)的平方 =119/169
所以sinx= -119/169
sin(x－45°)＝-5/13,sin2x
解方程：2sin²（x／2)＋5sin(x／2)－3＝0
设sin（45-x）=5/13,0
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