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    You are welcome

    You are welcome
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    Hint: \frac{d}{dr}=\frac{d}{dr'}...

    Hint:

    \frac{d}{dr}=\frac{d}{dr'} \frac{dr'}{dr}=\frac{d}{dr'} \frac{1}{a_0}

    \frac{d^2}{dr^2}=......
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