serk12's profile - activity

Thank you so much for an answer so well developed

So I'm trying to calculate the frenet thrihedrom in the "clasic" way, (doing an arc length and his integrals) but sage don't let me do a diff of a integral. Here ismy code:

var('t, n')
assume(n > 0)
c=vector((t,t**2,t**3))

l=sqrt(1+4*t*t+9*t**4)
L= l.integral(t, 0, n)

C=vector((t/L,(t/L)**2,(t/L)**3))
T=C.diff(t)

I get this error:

AttributeError: 'sage.rings.rational.Rational' object has no attribute 'diff'

Any idea of how to do a Diff of a integral?