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` vec aa n d vec b` are two unit vectors that are mutually perpendicular. A unit vector that is equally inclined to ` vec a , vec ba n d vec axx vec b` is a.`1/(sqrt(2))( vec a+ vec b+ vec axx vec b)` b. `1/2( vec axx vec b+ vec a+ vec b)` c. `1/(sqrt(3))( vec a+ vec b+ vec axx vec b)` d. `1/3( vec a+ vec b+ vec axx vec b)`

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