If vec a , vec b ,and vec c are non-cop...

If ` vec a , vec b ,and vec c` are non-coplanar unit vectors such that ` vec axx( vec bxx vec c)=( vec b+ vec c)/(sqrt(2)), vec b and vec c` are non-parallel, then prove that the angel between ` vec a and vec b, is 3pi//4.`

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