设向量a=(cosα,cosβ),b=(cosθ,cosφ),c=a+tb,(t属于R)其中αβθφ均为锐角且α+β=θ+φ=2(α+φ)=二分之派(1)求向量a和b的积(2)当t取何值时,向量c的摩长最小,最小值是多少?
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![设向量a=(cosα,cosβ),b=(cosθ,cosφ),c=a+tb,(t属于R)其中αβθφ均为锐角且α+β=θ+φ=2(α+φ)=二分之派(1)求向量a和b的积(2)当t取何值时,向量c的摩长最小,最小值是多少?](/uploads/image/z/8952556-4-6.jpg?t=%E8%AE%BE%E5%90%91%E9%87%8Fa%3D%28cos%CE%B1%2Ccos%CE%B2%29%2Cb%3D%28cos%CE%B8%2Ccos%CF%86%29%2Cc%3Da%2Btb%2C%28t%E5%B1%9E%E4%BA%8ER%EF%BC%89%E5%85%B6%E4%B8%AD%CE%B1%CE%B2%CE%B8%CF%86%E5%9D%87%E4%B8%BA%E9%94%90%E8%A7%92%E4%B8%94%CE%B1%2B%CE%B2%3D%CE%B8%2B%CF%86%3D2%EF%BC%88%CE%B1%2B%CF%86%EF%BC%89%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E6%B4%BE%EF%BC%881%EF%BC%89%E6%B1%82%E5%90%91%E9%87%8Fa%E5%92%8Cb%E7%9A%84%E7%A7%AF%EF%BC%882%EF%BC%89%E5%BD%93t%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%90%91%E9%87%8Fc%E7%9A%84%E6%91%A9%E9%95%BF%E6%9C%80%E5%B0%8F%2C%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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