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I have [tex] da=R^{2}sin(g)dgdh \hat{r} [/tex] with g and h angles

and [tex] \hat{r}=sin(g)cos(h) \hat{i}+sin(g)sin(h) \hat{j}+cos(g) \hat{k} [/tex]

But what is now [tex] da_{x}=dydz \hat{i} [/tex] in spherical coordinates?

So I have the expression in ordinary coordinates and need to find it in spherical coordinates

thanks