Yes, if you are the custodial parent, meaning that your daughter lived with you for the most nights of the year, you'll need to sign Form 8332 and give it to your ex so that he can claim the dependent on his return. He would attach the Form 8332 to his return if he's filing by mail, and if he's e-filing he'll attach it to Form 8453.
You don't have to send it in at all.
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