TS EAMCET 2016 Code A Solved Paper

Section: Mathematics
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Question : 60 of 160
 
Marks: +1, -0
If the angle between the lines whose direction cosines are (−‌
2
√21
,‌
C
√21
,‌
1
√21
)
and (‌
3
√54
,‌
3
√54
,−‌
6
√54
)
is ‌
Ï€
2
, then the value of C is
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