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im not sure, let me noe if im wrong: let u = pi^x du/dx = pi^x.loge(pi) du/loge(pi) = pi^x.dx if x= pi, u = pi^pi if x=0, u = 1 Integrating pi^x where u = pi^pi and u = 1 = 1/loge(pi) [u] from u = pi^pi to 1 = 1/loge(pi). (pi^pi -1)