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NORRISTOWN, Pa. — A lawyer for Bill Cosby all but threw in the towel Monday as he delivered lengthy, rambling closing arguments in the comedian’s sex assault trial.

“I pray to God you’ll do your job better than I did mine,” Brian McMonagle thundered to the panel of seven men and five women.

“If during the course of this trial I have said or done anything that might have offended one of you, hold it against me, not him. Me — not him. I wear my emotions on my sleeve and that’s not good for a lawyer.”

During the two-hour summations, which followed just one brief witness before the defense rested without Cosby testifying, McMonagle, often in a loud, shrill voice, reminded jurors that Cosby wasn’t prosecuted back in 2005 — when victim Andrea Constand first reported the assault to police — because the case was too weak.

“This is their evidence, that they gave you,” he said. “This is why this case went into a trash can because Mr. Cosby told them everything they needed to know. ‘We laid down, we did what we normally do, I went to bed. I got up, she was up. I made her a muffin.’”

McMonagle also zeroed in on discrepancies in Constand’s account of when the alleged sexual assault took place, telling jurors, “If that doesn’t make you hesitate, I don’t know what will.”

Constand initially told police that Cosby drugged and molested her in March 2004 — but then walked back that claim to sometime in January.

Constand also backpedaled on a previous claim to cops that she’d never bee​​n alone with Cosby before the assault — which she admitted wasn’t true.

“Be careful, be careful, a man’s life hangs on it,” McMonagle warned.

The lawyer tried to convince jurors — as ​the ​defense had throughout the trial — that Constand was pursuing a romantic relationship with Cosby leading up to the ​alleged ​assault and called him 53 times after it happened.

“Why are we running from the truth of this case, of the relationship? Why?” he asked.

McMonagle downplayed a prior deposition in which Cosby admitted obtaining Quaaludes decades ago to use on women he wanted to have sex with.

“He’s talking about things that happened in 1976!” he bellowed. “That’s what was going on back in the day.”

The lawyer also slammed Constand and accuser Kelly Johnson — who testified for the prosecution last week that Cosby also allegedly drugged and assaulted her — as liars.

“When you do things this way, it all blows up. Are you kidding me? It’s not right,” McMonagle ranted.

“I don’t care where you’re from, who you like, if you think he’s the worst comedian in the world. This isn’t right. The truth becomes a lie and a lie becomes a truth. And who’s the worst off for it? He is.”

Prosecutors will deliver their closing statements after the lunch break.