I have a question to find the covariance of sample mean and sample standard deviation based on the following:

I have tried something on my scratch paper, but for some reason, I cannot upload on here. so please anyone help me, Thanks a lot !!
I have a question to find the covariance of sample mean and sample standard deviation based on the following:

I have tried something on my scratch paper, but for some reason, I cannot upload on here. so please anyone help me, Thanks a lot !!
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