Python speed vs csharp

[John Machin]

bokr at oz.net (Bengt Richter) wrote in message news:<bgds3g$f95$0 at 216.39.172.122>...
>    erfcx = ( (a1 + (a2 + (a3 +
>              (a4 + a5*t)*t)*t)*t)*t ) * exp(-pow(x,2.0));

Wouldn't (x*x) be better than pow(x,2.0) ?