Hi folks,
Looks like sympy/dsolve produces an incorrect solution to an ODE:
from sympy import *
mass, g, b, t = symbols('mass g b t')
v, x = symbols('v x', cls=Function)
paraChute = mass*v(t).diff(t)-mass*g+b*(v(t))**2
solution = dsolve(paraChute,v(t),hint='lie_group')
solution
Out[1]:
Eq(v(t), sqrt(g)*sqrt(mass)/(sqrt(b)*tanh(sqrt(b)*sqrt(g)*(C1*mass +
t)/sqrt(mass))))
Sorry in advance if I'm doing something silly - the solution shouldn't be
1/tanh. Should be tanh.
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