((a p)/(c*(p-1))(inversebetaregularized(1-(p-1) p^p a^(p-1)/(c*(1-p))^p,2,-p)-1))^p+c* (a p)/(c*(p-1))(inversebetaregularized(1-(p-1) p^p a^(p-1)/(c*(1-p))^p,2,-p)-1)+a,p=-4,a=-khinchin,c=1/2