Help me, please. arcsin (sin(9Pi/5) = ? arctg (tg (7Pi/5) = ?

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Originally Posted by Netochka Help me, please. arcsin (sin(9Pi/5) = ? arctg (tg (7Pi/5) = ? Hi If you can find k integer so that then If not then exist n integer so that and then For instance For and then For and then For Arctan it is more simple so that

Thank you very much