hi all
i have 2 addresses that have same R value
address 1         same R
address 2         same R
i know R
i know S1    and S2
i know M signed message or Z    M1   and  M2
When a signing secret was used to sign two different messages, you can recover the signing secret with this calculation:
 k = (m1-m2)/(s1-s2)
the problem is that i can recover only privatekey of 1 address
i have need of recover privatekey address 2
what is correct formula  for recover the privatekey of address 1   and address 2 that have same R used in 2 different address?

thanks for your help