The equations cognition V and A are not symmetric with attention 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 use the constraint equation and choose to write h in https://az-directory.com/listings12753340/le-meilleur-c%C3%B4t%C3%A9-de-conversion-pdf