已知向量a=(2cosx/2,1+tan^2x),b=(根号2sin(π/4+x/2),cos^2x),令f(x)=a*b1 求f(x)在【0,π/2】上的单调区间2若f(a)=11/4,a属于(π/2,π),求F(-a)的值
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![已知向量a=(2cosx/2,1+tan^2x),b=(根号2sin(π/4+x/2),cos^2x),令f(x)=a*b1 求f(x)在【0,π/2】上的单调区间2若f(a)=11/4,a属于(π/2,π),求F(-a)的值](/uploads/image/z/3935776-40-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%282cosx%2F2%2C1%2Btan%5E2x%29%2Cb%3D%28%E6%A0%B9%E5%8F%B72sin%28%CF%80%2F4%2Bx%2F2%29%2Ccos%5E2x%29%2C%E4%BB%A4f%28x%29%3Da%2Ab1+%E6%B1%82f%28x%29%E5%9C%A8%E3%80%900%2C%CF%80%2F2%E3%80%91%E4%B8%8A%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B42%E8%8B%A5f%28a%29%3D11%2F4%2Ca%E5%B1%9E%E4%BA%8E%28%CF%80%2F2%2C%CF%80%29%2C%E6%B1%82F%28-a%29%E7%9A%84%E5%80%BC)
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