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[" If "bar(a)" and "bar(b)" are vectors such that "|vec a+vec b|=sqrt(29)" and "vec a times(2hat i+3hat j+4hat k)=(2hat i+3hat j+4hat k)timesvec b," then a "],[" possible value of "(bar(a)+bar(b))*(-7hat i+2hat j+3hat k)" is "]

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