已知sin(x+π/6)=1/4,求sin(7π/6+x)+cos(5π/6-x)平方的值已知sin(x+π/6)=1/4,求sin(7/6π+x)+cos(5/6π-x)平方的值

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已知sin(x+π/6)=1/4,求sin(7π/6+x)+cos(5π/6-x)平方的值已知sin(x+π/6)=1/4,求sin(7/6π+x)+cos(5/6π-x)平方的值已知sin(x+π/

已知sin(x+π/6)=1/4,求sin(7π/6+x)+cos(5π/6-x)平方的值已知sin(x+π/6)=1/4,求sin(7/6π+x)+cos(5/6π-x)平方的值
已知sin(x+π/6)=1/4,求sin(7π/6+x)+cos(5π/6-x)平方的值
已知sin(x+π/6)=1/4,求sin(7/6π+x)+cos(5/6π-x)平方的值

已知sin(x+π/6)=1/4,求sin(7π/6+x)+cos(5π/6-x)平方的值已知sin(x+π/6)=1/4,求sin(7/6π+x)+cos(5/6π-x)平方的值
因为sin(x+π/6)=1/4,所以sin(7π/6+x)=sin(π+π/6+x)=-sin(x+π/6)=-1/4,
cos^(5π/6-x)=cos^(π-(π/6+x))=cos^(x+π/6)=1-sin^(x+π/6)=1-/16=15/16.
sin(7π/6+x)+cos^2(5π/6-x)=-1/4+15/16=11/16

shi 5

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