设α,β为锐角,且a=(sinα,-cos) b=(-cosβ,sinβ)a+b=(根号6/6,根号2/2)求cos(α+β) 求详解
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![设α,β为锐角,且a=(sinα,-cos) b=(-cosβ,sinβ)a+b=(根号6/6,根号2/2)求cos(α+β) 求详解](/uploads/image/z/2620410-42-0.jpg?t=%E8%AE%BE%CE%B1%2C%CE%B2%E4%B8%BA%E9%94%90%E8%A7%92%2C%E4%B8%94a%3D%28sin%CE%B1%2C-cos%EF%BC%89+b%3D%EF%BC%88-cos%CE%B2%2Csin%CE%B2%EF%BC%89a%2Bb%3D%EF%BC%88%E6%A0%B9%E5%8F%B76%2F6%2C%E6%A0%B9%E5%8F%B72%2F2%EF%BC%89%E6%B1%82cos%EF%BC%88%CE%B1%2B%CE%B2%EF%BC%89+%E6%B1%82%E8%AF%A6%E8%A7%A3)
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