Jove! it's stupidity on my part.

Thanks

Le jeudi 13 février 2020 16:16:23 UTC+1, Jean-François Ingenbleek a écrit :
>
> var("u,v,l",domain=RR)
> sigma = vector([u*cos(v),u*sin(v),l*u])
> Dsigma = matrix([[diff(s,u) for s in sigma],[diff(s,v) for s in 
> sigma]]).transpose()
> print(Dsigma)
> EFG = (Dsigma.transpose())*Dsigma
> EFG.simplify_trig()
> print(EFG)
>
> gives
>
> [   cos(v) -u*sin(v)]
> [   sin(v)  u*cos(v)]
> [        l         0]
>
> [  l^2 + cos(v)^2 + sin(v)^2                           0]
> [                          0 u^2*cos(v)^2 + u^2*sin(v)^2]
>
>
> Why Simplify_trig does not work in this case?
>
>
> Thanks to everybody
>
>

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