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

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))` , then the angle between ` vec a and vec b` is a. `3pi//4` b. `pi//4` c. `pi//2` d. `pi`

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