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Question

If the direction cosines of a line are (221,C21,121) then the value of C is

A
6
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B
4
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C
4
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D
2
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Solution

The correct options are
B 4
C 4
Given that the directional cosines of a line is 221,C21,121
We know that the sum of squares of directional cosines is equal to 1
(221)2+(C21)2+(121)2=1
C2=2141=16
C=±4
So the correct option is B,C

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