已知:sin(x+π/6)=1/4,求sin(x+7π/6)+cos^2 (5π/6-x)的值
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已知:sin(x+π/6)=1/4,求sin(x+7π/6)+cos^2 (5π/6-x)的值
![已知:sin(x+π/6)=1/4,求sin(x+7π/6)+cos^2 (5π/6-x)的值](/uploads/image/z/19247074-34-4.jpg?t=%E5%B7%B2%E7%9F%A5%3Asin%28x%2B%CF%80%2F6%29%3D1%2F4%2C%E6%B1%82sin%28x%2B7%CF%80%2F6%29%2Bcos%5E2+%285%CF%80%2F6-x%29%E7%9A%84%E5%80%BC)
sin(x+7π/6)=sin(x+π/6+π)=-1/4
sin(5π/6-x)=:sin(x+π/6-π)=-1/4
cos^2 (5π/6-x)=1-1/16=15/16
sin(x+7π/6)+cos^2 (5π/6-x)=11/16
sin(5π/6-x)=:sin(x+π/6-π)=-1/4
cos^2 (5π/6-x)=1-1/16=15/16
sin(x+7π/6)+cos^2 (5π/6-x)=11/16
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