sin(x+派/6)=-1/2 x=

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sin(x+派/6)=-1/2 x=

sin(x+派/6)=-1/2 x=
sin(x+派/6)=-1/2 x=

sin(x+派/6)=-1/2 x=
sin(x+π/6)=-1/2
x+π/6=-π/6+2kπ
或x+π/6=-5π/6+2kπ
解得
x=-π/3+2kπ 或x=-π+2kπ

π