[" Q12.Let "widehat a" and "hat b" be tw...

[" Q12.Let "widehat a" and "hat b" be two unit vectors.If the vectors "vec c=widehat a+2hat b" and "vec d=5vec a-4vec b" are "],[" perpendicular to each other,then the angle between "widehat a" and "hat b" is "],[[" A "(pi)/(6)," dolve "QP],[" B "(pi)/(2)," (c) "q grad]]

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[" Q12.Let "widehat a" and "hat b" be two unit vectors.If the vectors "vec c=widehat a+2hat b" and "vec d=5vec a-4vec b" are "],[" perpendicular to each other,then the angle between "widehat a" and "hat b" is "],[[" A "(pi)/(6)," dolve "QP],[" B "(pi)/(2)," (c) "q grad]]

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