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[" If "vec a=xvec i+(x-1)vec j+vec k" an...

[" If "vec a=xvec i+(x-1)vec j+vec k" and "vec b=(x+1)vec i+vec j+avec k" always make an acute angle for all "x in R],[" then the least integral value of "a" is "],[[" 1) "3," 2) "4," 3) "5," 4) "6]]

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