Question: If 3 a + 2b is perpendicular to 2a 3b, and 21 a I = 31 b I , find the angle between a

If 3 a + 2b is perpendicular to 2a 3b, and 21
a I = 31 b I , find the angle between a

If 3 a + 2b is perpendicular to 2a 3b, and 21 a I = 31 b I , find the angle between a and b.

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