If sin A =4/5 and cos B = - 12/13, where A is acute angles and B is obtuse angles, determine the values of sin 2A and tan (A-B)

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in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.