已知f(x)=sinx+2sin(π/4+x/2)cos(π/4+x/2).若f(a)=√2/2,a∈(-π/2,0),求a的值请告诉我答案及解题过程!谢谢!若sin(x/2)=4/5,x∈(π/2,π),f(x)=?
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![已知f(x)=sinx+2sin(π/4+x/2)cos(π/4+x/2).若f(a)=√2/2,a∈(-π/2,0),求a的值请告诉我答案及解题过程!谢谢!若sin(x/2)=4/5,x∈(π/2,π),f(x)=?](/uploads/image/z/1700047-55-7.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%3Dsinx%2B2sin%28%CF%80%2F4%2Bx%2F2%29cos%28%CF%80%2F4%2Bx%2F2%29.%E8%8B%A5f%28a%29%3D%E2%88%9A2%2F2%2Ca%E2%88%88%28-%CF%80%2F2%2C0%29%2C%E6%B1%82a%E7%9A%84%E5%80%BC%E8%AF%B7%E5%91%8A%E8%AF%89%E6%88%91%E7%AD%94%E6%A1%88%E5%8F%8A%E8%A7%A3%E9%A2%98%E8%BF%87%E7%A8%8B%21%E8%B0%A2%E8%B0%A2%21%E8%8B%A5sin%28x%2F2%29%3D4%2F5%2Cx%E2%88%88%28%CF%80%2F2%2C%CF%80%29%2Cf%28x%29%3D%3F)
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