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Let hat a and hat b be two unit vector...

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

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