若F(X)=cos∧2(x/4)-2sin∧2(x/4)+3√3sin(x/4)*cos(x/4) x∈(2/3派,3/4派),求f(X)的最大值
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![若F(X)=cos∧2(x/4)-2sin∧2(x/4)+3√3sin(x/4)*cos(x/4) x∈(2/3派,3/4派),求f(X)的最大值](/uploads/image/z/7083598-22-8.jpg?t=%E8%8B%A5F%28X%29%3Dcos%E2%88%A72%28x%2F4%29-2sin%E2%88%A72%28x%2F4%29%EF%BC%8B3%E2%88%9A3sin%28x%2F4%29%2Acos%28x%2F4%29+x%E2%88%88%282%2F3%E6%B4%BE%2C3%2F4%E6%B4%BE%29%2C%E6%B1%82f%28X%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC)
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若F(X)=cos∧2(x/4)-2sin∧2(x/4)+3√3sin(x/4)*cos(x/4) x∈(2/3派,3/4派),求f(X)的最大值
若F(X)=cos∧2(x/4)-2sin∧2(x/4)+3√3sin(x/4)*cos(x/4) x∈(2/3派,3/4派),求f(X)的最大值
若F(X)=cos∧2(x/4)-2sin∧2(x/4)+3√3sin(x/4)*cos(x/4) x∈(2/3派,3/4派),求f(X)的最大值
f(x)=cos(x/2)-sin^2(x/4)+3根号3/2sin(x/2)
=cos(x/2)-(1-cos(x/2))/2+3根号3/2sinx/2
=3/2cosx/2+3根号3/2sinx/2-1/2
=3sin(x/2+Pai/6)-1/2
2/3Pai=
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若F(X)=cos∧2(x/4)-2sin∧2(x/4)+3√3sin(x/4)*cos(x/4) x∈(2/3派,3/4派),求f(X)的最大值
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