已知向量a=(cosa,sina),向量b=(cosβ,sinβ) (1) 求向量a乘(向量a+2向量b)的取值范围(2)若a-β=π/3,求|向量a+2向量b|
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![已知向量a=(cosa,sina),向量b=(cosβ,sinβ) (1) 求向量a乘(向量a+2向量b)的取值范围(2)若a-β=π/3,求|向量a+2向量b|](/uploads/image/z/1786614-6-4.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28cosa%2Csina%29%2C%E5%90%91%E9%87%8Fb%3D%28cos%CE%B2%2Csin%CE%B2%29+%EF%BC%881%EF%BC%89+%E6%B1%82%E5%90%91%E9%87%8Fa%E4%B9%98%28%E5%90%91%E9%87%8Fa%2B2%E5%90%91%E9%87%8Fb%29%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89%E8%8B%A5a-%CE%B2%3D%CF%80%2F3%2C%E6%B1%82%7C%E5%90%91%E9%87%8Fa%2B2%E5%90%91%E9%87%8Fb%7C)
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