已知sin(x+π/6)=1/4,求cos^2(5π/6—x)的值
1个回答
sin(x+π/6)=1/4
则:sin(5π/6-x)=sin(x+π/6)=1/4
所以,cos²(5π/6-x)=1-sin²(5π/6-x)=15/16
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