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[" 260.Let "hat a" and "hat b" be two un...

[" 260.Let "hat a" and "hat b" be two unit vectors.If the vectors "],[vec c=hat a+2hat b" and "vec d=5hat a-4hat b" are perpendicular to "],[" each other,then the angle between "hat a" and "hat b" is "],[[" (1) "(pi)/(4)," (2) "(pi)/(6)],[" (3) "(pi)/(2)," (4) "(pi)/(3)]]

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