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Grade: 12th pass 
        
the value of c so that for all real x the vectors 
cxi- 6j +3k  and xi +2j + 2cxk make an obtuse angle are-
one month ago

Answers : (1)

Arun
21973 Points 
							 
there will not be value of c it will be interval
for obtuse angle make dot product product between the vectors negative
we get  cx2 -12+3cx 
as x belongs to real u can find out the interval of c easily
 
one month ago
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