The angle between the lines, whose direction cosines ,m,n satisfy the equation +m+n=0 and 2 ^2+2m^2-n^2=0, is

MHT CET 2023 Mathematics question

The angle between the lines, whose direction cosines satisfy the equation and , is

Answer: (B)

From , . Substitute in the second equation: , and then . Using : , . So the two sets of direction cosines are

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Question ID VK-098368