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)
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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)

sin(x/2+派/6)=1/2,求cos(x+派/3)
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