The range of the function f (x) = is
{1, 2, 3}
{1, 2, 3, 4, 5, 6}
{1, 2, 3, 4}
{1, 2, 3, 4, 5}
A.
{1, 2, 3}
The given function f(x) = would be defined,if
If the relation between direction ratios of two lines are given by a + b + c = 0 and 2ab + 2ac - bc = 0, then the angle between the lines is