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[" The set of values of "c" for which th...

[" The set of values of "c" for which the angle between the vectors "cxi-6hat j+3hat k&xi-2hat j+2cxhat k" is "],[" acute for every "x in R" is "],[[" (A) "(0,4/3)," (B) "[0,4/3]," (C) "(11/9,4/3)," (D) "[0,4/3)]]

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