已知f(x)=2cos(x+π/4)cos(x-π/4) (1)求函数f(x)的单调增区间 (2)若f(α)=12/13,α∈(-π/2,0),求sin(α-π/4)的值(3)设函数g(x)=f(x)+√3sin2x,x∈[-π/6,π/4],求x的值,使得g(x)取
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![已知f(x)=2cos(x+π/4)cos(x-π/4) (1)求函数f(x)的单调增区间 (2)若f(α)=12/13,α∈(-π/2,0),求sin(α-π/4)的值(3)设函数g(x)=f(x)+√3sin2x,x∈[-π/6,π/4],求x的值,使得g(x)取](/uploads/image/z/1698380-44-0.jpg?t=%E5%B7%B2%E7%9F%A5f%EF%BC%88x%EF%BC%89%3D2cos%EF%BC%88x%2B%CF%80%2F4%EF%BC%89cos%EF%BC%88x-%CF%80%2F4%EF%BC%89+%EF%BC%881%EF%BC%89%E6%B1%82%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%E7%9A%84%E5%8D%95%E8%B0%83%E5%A2%9E%E5%8C%BA%E9%97%B4+%EF%BC%882%EF%BC%89%E8%8B%A5f%EF%BC%88%CE%B1%EF%BC%89%3D12%2F13%2C%CE%B1%E2%88%88%EF%BC%88-%CF%80%2F2%2C0%EF%BC%89%2C%E6%B1%82sin%EF%BC%88%CE%B1-%CF%80%2F4%EF%BC%89%E7%9A%84%E5%80%BC%EF%BC%883%EF%BC%89%E8%AE%BE%E5%87%BD%E6%95%B0g%EF%BC%88x%EF%BC%89%3Df%EF%BC%88x%EF%BC%89%2B%E2%88%9A3sin2x%2Cx%E2%88%88%5B-%CF%80%2F6%2C%CF%80%2F4%5D%2C%E6%B1%82x%E7%9A%84%E5%80%BC%2C%E4%BD%BF%E5%BE%97g%EF%BC%88x%EF%BC%89%E5%8F%96)
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