I have an equation that looks like(adsbygoogle = window.adsbygoogle || []).push({});

A_{t, r}= A_{φ, r}

If I know that A_{φ}= r^{4}, then how do I find A_{t}?

I believe that the above equation is equivalent to: ∂/∂r (A_{t}) = ∂/∂r (A_{φ}) , correct?

Then substitute the value A_{φ}and we have ∂/∂r (A_{t}) = ∂/∂r (r^{4})

And then to get A_{t}I take the integral on both sides? so eventually A_{t}= r^{5}/5 ?

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# I Subscript derivative notation

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