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[" If "|a+b|<|a-b|" ,then the angle betw...

[" If "|a+b|<|a-b|" ,then the angle between "a" and "b" can "],[" lie in the interval."],[[" (a) "(-pi/2,pi/2)," (b) "(0,pi)],[" (c) "(pi/2,3 pi/2)," (d) "(0,2 pi)]]

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