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[" If "bar(a)" and "bar(b)" are two vectors and "q" is angle between them then the unit vector bisecting the angle "],[" between them is "bar(" b) ")(bar(a)-bar(b))/(sqrt(2))],[[(a-delta)/(|a+b|)," D) "(bar(a)-bar(b))/(sqrt(a)+bar(b))],[(bar(a)+bar(b))/(2)," (i) "]]

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