I already explained all this previously in this post:
https://bitcointalk.org/index.php?topic=5418919.msg61215046#msg61215046So he didn't inform that he know the first privatekey.
He did:
i have recovered privatekey address 1
so what is privatekey1 and privatekey2 or nonce?
You are asking the wrong question. As stanner.austin has correctly pointed out, OP has said he already knows the private key from the first transaction, as has therefore managed to recover k. With this knowledge of k, s, and z for the second transaction, then the second transaction's private key can be calculated.