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[" Let â and "hat b" be two unit vectors...

[" Let â 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 â and "hat b" is : "],[qquad [(1)(pi)/(4)," (2) "(pi)/(6)," (3) "(pi)/(2)],[hline]]

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