Prove that each element in Pentagon D5 has a unique inverse under the binary operation. D5={AF, BF,...

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Prove that each element in Pentagon D5 has a unique inverseunder the binary operation.

D5={AF, BF, CF, DF, EF,0,72,144,216,288}

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SolutionSet of symmetries of an regular pentagon with vertices levelled asin anticlockwise order There are rotations where means rotation about degrees and reflections where    See Answer
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