已知向量a=(cos3θ/2,sin3θ/2),b=(cosθ/2,-sinθ/2),θ属于[0,π/3] 1) 求a·b/(|a+b|)的最大值已知向量a=(cos3θ/2,sin3θ/2),b=(cosθ/2,-sinθ/2),θ属于[0,π/3]1) 求a·b/(|a+b|)的最大值、最小值;2) 若|ka+b|=(√3)|a-
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![已知向量a=(cos3θ/2,sin3θ/2),b=(cosθ/2,-sinθ/2),θ属于[0,π/3] 1) 求a·b/(|a+b|)的最大值已知向量a=(cos3θ/2,sin3θ/2),b=(cosθ/2,-sinθ/2),θ属于[0,π/3]1) 求a·b/(|a+b|)的最大值、最小值;2) 若|ka+b|=(√3)|a-](/uploads/image/z/2483087-23-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28cos3%CE%B8%2F2%2Csin3%CE%B8%2F2%29%2Cb%3D%28cos%CE%B8%2F2%2C-sin%CE%B8%2F2%29%2C%CE%B8%E5%B1%9E%E4%BA%8E%5B0%2C%CF%80%2F3%5D+1%EF%BC%89+%E6%B1%82a%C2%B7b%2F%28%7Ca%2Bb%7C%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28cos3%CE%B8%2F2%2Csin3%CE%B8%2F2%29%2Cb%3D%28cos%CE%B8%2F2%2C-sin%CE%B8%2F2%29%2C%CE%B8%E5%B1%9E%E4%BA%8E%5B0%2C%CF%80%2F3%5D1%EF%BC%89+%E6%B1%82a%C2%B7b%2F%28%7Ca%2Bb%7C%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E3%80%81%E6%9C%80%E5%B0%8F%E5%80%BC%EF%BC%9B2%EF%BC%89+%E8%8B%A5%7Cka%2Bb%7C%3D%EF%BC%88%E2%88%9A3%EF%BC%89%7Ca-)
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