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Q.

A straight line passing through  1,1,1makes an angle of 600 with the positive direction of the z-axis and the cosines of the angles made with the positive directions of y, x-axis are in the ratio  3:1then the acute angle between the two possible positions of the line is

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a

π2

b

π6

c

π3

d

π4

answer is C.

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Detailed Solution

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cos2α+cos2β+cos2α=1
cosα=12
cosβ=3xcosγ=x

 Now 14+3x2+x2=1
x=±34
 * d.c's of L1=12,34,34
 * d.c's of L1=12,34,34

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