1-2sinx*sin(60+x)sin(60-x)
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1-2sinx*sin(60+x)sin(60-x)1-2sinx*sin(60+x)sin(60-x)1-2sinx*sin(60+x)sin(60-x)1-2sinx*sin(60+x)sin(6
1-2sinx*sin(60+x)sin(60-x)
1-2sinx*sin(60+x)sin(60-x)
1-2sinx*sin(60+x)sin(60-x)
1-2sinx*sin(60+x)sin(60-x)
=1-2sinx[(sin60cosx+cos60sinx)*(sin60cosx-cos60sinx)]
=1-2sinx(sin²60cos²x-cos²60sin²x)
=1-2sinx(3/4cos²x-1/4sin²x)
=1-1/2 sinx(3cos²x-sin²x)
如果还想化简就把sinx乘进去
如果想只剩下sinx
则原式=1-1/2sinx(3-4sin²x)
=1-3/2sinx +2sin²x
1-2sinx*sin(60+x)sin(60-x)
化简sin(x+60)+2sinx-60
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sinx+sin-x=
解方程sinx+sin(60-x)=sin(60+x)
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