Please help me expand this function in Maclaurin's series to find an interval of convergence.

I tried to turn it into this expression:

but it doesn't give me the result. Help me please it's very important
Please help me expand this function in Maclaurin's series to find an interval of convergence.

I tried to turn it into this expression:

but it doesn't give me the result. Help me please it's very important
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