证明sin(x1+x2)-sinx1=2sin(x2/2)cos(x1+x2/2)
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证明sin(x1+x2)-sinx1=2sin(x2/2)cos(x1+x2/2)
![证明sin(x1+x2)-sinx1=2sin(x2/2)cos(x1+x2/2)](/uploads/image/z/1975621-13-1.jpg?t=%E8%AF%81%E6%98%8Esin%28x1%2Bx2%29-sinx1%3D2sin%28x2%2F2%29cos%28x1%2Bx2%2F2%29)
和差化积立得
证明sin(x1+x2)-sinx1=2sin(x2/2)cos(x1+x2/2)
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