The equations cognition V and A are not symmetric with respect to h and r, i.e. the influence of h and r on the problem are inherently different. We need to write A in terms of purely 1 variable. We habitudes the constraint equation and choose to write h in https://directorypile.com/listings12740890/non-connu-d%C3%A9tails-propos-de-seo-on-page