sin(x/2+派/6)=1/2,求cos(x+派/3)
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sin(x/2+派/6)=1/2,求cos(x+派/3)
![sin(x/2+派/6)=1/2,求cos(x+派/3)](/uploads/image/z/6456697-25-7.jpg?t=sin%28x%2F2%2B%E6%B4%BE%2F6%29%3D1%2F2%2C%E6%B1%82cos%28x%2B%E6%B4%BE%2F3%29)
得x=4kπ(k为整数)或x=4π/3+4kπ(k为整数).代入求得cos(x+π/3)的值为1/2或-1/2
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