I Spin spin coupling problem an electron/positron system

Hayam ramadan
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I am unable to solve this problem ... I found that chegg website has a solution but I dont have a credit card to pay ... i have exam by tmrw
Can anyone please help me out?
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Hayam ramadan said:
Can anyone please help me out?
Not in this forum. If you want help on a homework problem, you will need to post your question in the relevant homework forum. Also you will need to fill out the homework template, which requires you to post the relevant equations (using the PF LaTeX feature, not an image) and your attempt at a solution.

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