Question
The equation of a line is given by . Write the direction cosines of a line parallel to the above line.
Solution
The equation of given line is

or
Its direction ratios are - 2, 3, 6
∴ direction ratios of a line parallel to given line are – 2, 3, 6.
∴ direction cosines of line are
i.e.,

or

Its direction ratios are - 2, 3, 6
∴ direction ratios of a line parallel to given line are – 2, 3, 6.
∴ direction cosines of line are

i.e.,
