In a historic trial, an ailing, 83-year-old Hosni Mubarak, lying ashen-faced on a hospital bed inside a metal defendants cage with his two sons beside him in white prison uniforms, denied charges of complicity in the killings of protestors and of corruption. The spectacle, aired live on state television, was the biggest humiliation for Egypts former president since his ouster nearly six months ago. But it went a long way to satisfy one of the key demands that has united protesters since Feb. 11, the day the regime was toppled. It was the first time Egyptians have seen Mubarak since Feb. 10, when he gave a defiant TV address refusing to resign.