PeterDonis
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Bishal Banjara said:"I want to know whether I am doing wrong though metric is independent to the final result or it doesn't reconcile, naturally", what should we be concluded?
I'm not sure what you're asking.
If you're asking whether what you did in the OP of this thread is correct, I have already said that it's wrong, and explained why. See my posts #10 and #11.
If you are asking whether you can obtain the inverse metric ##g^{\alpha \beta}## by raising both indexes on the metric ##g_{\alpha \beta}##, it should be obvious that you can't, since in order to raise indexes you need to already know the inverse metric ##g^{\alpha \beta}##. You obtain the inverse metric by considering the metric as a matrix and obtaining its matrix inverse.