If vec a and vec b are unit vectors su...

If ` vec a and vec b` are unit vectors such that `( vec a+ vec b).[(2 vec a+3 vec b)xx(3 vec a-2 vec b)]=0` , then angle between `veca` and ` vec b` is a.`0` b. `pi//2` c. `pi` d. indeterminate

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