The angle theta between the vector vec(p)=hat(i)+hat(j)+hat(k) and unit vector along X-axis is

The angle theta between the vector vec(p)=hat(i)+hat(j)+hat(k) and uni

1.	The angle theta between the vector vec(p)=hat(i)+hat(j)+hat(k) and unit vector along X-axis is
Answer» `COS^(-1)((1)/(sqrt3))` `cos^(-1)((1)/(SQRT2))` `cos^(-1)((sqrt3)/(2))` `cos^(-1)((1)/(2))` ANSWER :A