If the two directional cosines of a vectors are (1)/(sqrt(2)) and (1)/(sqrt(3)) then the value of thirs directional cosine is

If the two directional cosines of a vectors are (1)/(sqrt(2)) and (1)/

1.	If the two directional cosines of a vectors are (1)/(sqrt(2)) and (1)/(sqrt(3)) then the value of thirs directional cosine is
Answer» `(1)/(SQRT(6))` `(1)/(sqrt(5))` `(1)/(sqrt(7))` `(1)/(sqrt(10))` Answer :A