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Determine the value of 'c' so that for all real x, the vector cxi - 6j - 3k and xi + 2j + 2cxk make an obtuse angle with each other.

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Determine the value of  'c' so that for all real x, the vector cxi - 6j - 3k and xi + 2j + 2cxk make an obtuse angle with each other.

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=> c < 0 and c > - 4/3

. .. c ∈ (-4/3, 0)

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