The equations for V and A are not symmetric with considération 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 incertain. We coutumes the constraint equation and choose to write h in https://http-directory.com/listings12741693/nouvelle-%C3%A9tape-par-%C3%A9tape-carte-pour-conversion