已知A,B是三角形ABC的两个内角,向量a={根号2* Cos(A+B)/2}i+ {Sin(A-B)/2}j,其中i,j为互相垂直的单
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![已知A,B是三角形ABC的两个内角,向量a={根号2* Cos(A+B)/2}i+ {Sin(A-B)/2}j,其中i,j为互相垂直的单](/uploads/image/z/1618205-5-5.jpg?t=%E5%B7%B2%E7%9F%A5A%2CB%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%86%85%E8%A7%92%2C%E5%90%91%E9%87%8Fa%3D%7B%E6%A0%B9%E5%8F%B72%2A+Cos%EF%BC%88A%2BB%EF%BC%89%2F2%7Di%2B+%7BSin%EF%BC%88A-B%EF%BC%89%2F2%7Dj%2C%E5%85%B6%E4%B8%ADi%2Cj%E4%B8%BA%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%E7%9A%84%E5%8D%95)
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已知A,B是三角形ABC的两个内角,向量a={根号2* Cos(A+B)/2}i+ {Sin(A-B)/2}j,其中i,j为互相垂直的单
已知A,B是三角形ABC的两个内角,向量a={根号2* Cos(A+B)/2}i+ {Sin(A-B)/2}j,其中i,j为互相垂直的单
已知A,B是三角形ABC的两个内角,向量a={根号2* Cos(A+B)/2}i+ {Sin(A-B)/2}j,其中i,j为互相垂直的单
向量a=[√2* Cos(A+B)/2,Sin(A-B)/2]