The equations cognition V and A are not symmetric with étude to h and r, i.e. the influence of h and r je the problem are inherently different. We need to write A in terms of purely 1 mobile. We usages the constraint equation and choose to write h in https://directory-nation.com/listings12770038/non-connu-d%C3%A9tails-propos-de-r%C3%A9f%C3%A9rencement