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Replace in Modules


why doesn't the following give me the square root?

f[x_] := Module[{a, y},y = x;Return[FindRoot[y == a^2, {a, 1}]]]

f[z] /. {z -> 2}

where as

f[x_] := Module[{a},Return[FindRoot[x == a^2, {a, 1}]]]

f[z] /. {z -> 2}

works fine?



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