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Determine the value of c so that for all...

Determine the value of `c` so that for all real `x` , vectors `c x hat i-6 hat j-3 hat k and x hat i+2 hat j+2c x hat k` make an obtuse angle with each other.

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The correct Answer is:
`c in (-4/3,0)`
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VMC MODULES ENGLISH-VECTORS -JEE ADVANCED (ARCHIVE) (TRUE/ FALSE)
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