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overset(harr)("AB ") and overset(harr)("...

`overset(harr)("AB ") and overset(harr)("DC ")` are two parallel lines and a transversal l, intersects `overset(harr)("AB ")` at P and `overset(harr)("DC ")` at R. Prove that the bisectors of the interior angles form a rectangle.

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