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problem 2: Given three non-zero vectors v1, v2, v3 we say that they are mutually orthogonal when v1 dot v2= 0, v1 dot v3=0 , v2 dot v3=0. Sho wthat if v1+v2+v3 are mutually orthogonal then for any vector v we can write v= av1+ bv2+ cv3 for some real number a,b,c. (hint: Use the dot product on the equation v= av1+ bv2+cv3)