已知cos(2x+π/3)=-1/2 x∈[-π/6,π/3] 求x 已知三角函数值求角的问题
1个回答
因为:x∈[-π/6,π/3]
所以:2x+π/3∈[0,π]
由cos(2x+π/3)=-1/2 ,得:2x+π/3=2π/3,
所以:x=π/6 .
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