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If (→a+3→b) is perpendicular to (7→a−5→b) and (→a−4→b) is perpendicular to (7→a−2→b), then the angle between →a and →b (in degrees) is

Answer» If (a+3b) is perpendicular to (7a5b) and (a4b) is perpendicular to (7a2b), then the angle between a and b (in degrees) is


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