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If vec a and vec b are unequal unit vec...

If ` vec a` and `vec b` are unequal unit vectors such that `( vec a- vec b)xx[( vec b+ vec a)xx(2 vec a+ vec b)]= vec a+ vec b ,` then angle `theta` between ` vec aa n d vec b` is `0` b. `pi//2` c. `pi//4` d. `pi`

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