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If vec a , vec ba n d vec c are non-cop...

If ` vec a , vec ba n d 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 aa n d vec b` is `3pi//4` b. `pi//4` c. `pi//2` d. `pi`

A

`3pi//4`

B

`pi//4`

C

`pi//2`

D

`pi`

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A
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