已知向量a=(cosx,sinx),|b|=1,且a与b满足|ka+b|=根号3|a-kb|已知a=(cosx,sinx),b=1,且a与b满足|ka+b|=根号3|a-kb|(k>0).1)用k表示a×b,并求a×b的最小值(2)若0≤x≤π,b=(1\2,根号3\2)求a*b的最大值及相应的x值
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![已知向量a=(cosx,sinx),|b|=1,且a与b满足|ka+b|=根号3|a-kb|已知a=(cosx,sinx),b=1,且a与b满足|ka+b|=根号3|a-kb|(k>0).1)用k表示a×b,并求a×b的最小值(2)若0≤x≤π,b=(1\2,根号3\2)求a*b的最大值及相应的x值](/uploads/image/z/6798331-19-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28cosx%2Csinx%29%2C%7Cb%7C%3D1%2C%E4%B8%94a%E4%B8%8Eb%E6%BB%A1%E8%B6%B3%7Cka%2Bb%7C%3D%E6%A0%B9%E5%8F%B73%7Ca-kb%7C%E5%B7%B2%E7%9F%A5a%3D%28cosx%2Csinx%29%2Cb%3D1%2C%E4%B8%94a%E4%B8%8Eb%E6%BB%A1%E8%B6%B3%7Cka%2Bb%7C%3D%E6%A0%B9%E5%8F%B73%7Ca-kb%7C%28k%3E0%29.1%29%E7%94%A8k%E8%A1%A8%E7%A4%BAa%C3%97b%2C%E5%B9%B6%E6%B1%82a%C3%97b%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%EF%BC%882%29%E8%8B%A50%E2%89%A4x%E2%89%A4%CF%80%2Cb%3D%EF%BC%881%5C2%2C%E6%A0%B9%E5%8F%B73%5C2%29%E6%B1%82a%2Ab%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E5%8F%8A%E7%9B%B8%E5%BA%94%E7%9A%84x%E5%80%BC)
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