在ABC中,A,B,C为三个内角,f(B)=4cosB * sin^2(π/4 + B/2)+根号3 cos2B - 2cosB.1.若f(B),求角B的度数2.若f(B)-m>2h恒成立,求M的取值范围1.若f(B)=2,求角B的度数
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![在ABC中,A,B,C为三个内角,f(B)=4cosB * sin^2(π/4 + B/2)+根号3 cos2B - 2cosB.1.若f(B),求角B的度数2.若f(B)-m>2h恒成立,求M的取值范围1.若f(B)=2,求角B的度数](/uploads/image/z/5239465-25-5.jpg?t=%E5%9C%A8ABC%E4%B8%AD%2CA%2CB%2CC%E4%B8%BA%E4%B8%89%E4%B8%AA%E5%86%85%E8%A7%92%2Cf%EF%BC%88B%EF%BC%89%3D4cosB+%2A+sin%5E2%EF%BC%88%CF%80%2F4+%2B+B%2F2%29%2B%E6%A0%B9%E5%8F%B73+cos2B+-+2cosB.1.%E8%8B%A5f%EF%BC%88B%EF%BC%89%2C%E6%B1%82%E8%A7%92B%E7%9A%84%E5%BA%A6%E6%95%B02.%E8%8B%A5f%28B%29-m%3E2h%E6%81%92%E6%88%90%E7%AB%8B%2C%E6%B1%82M%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B41.%E8%8B%A5f%EF%BC%88B%EF%BC%89%3D2%EF%BC%8C%E6%B1%82%E8%A7%92B%E7%9A%84%E5%BA%A6%E6%95%B0)
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