The angle between the lines whose direction cosines are given by the equation , is |
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a) |
b) |
c) |
d) |

The angle between the lines whose direction cosines are given by the equation , is |
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a) |
b) |
c) |
d) |

1 Answer

127 votes

**(c)**

We are given by and and we have

So that,

And

Either or , if

So, the direction cosines of one of the lines are and if and the direction cosines of the other line are

Hence, the required angle is

127 votes

127