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Many in the crowd booed Mrs. Arroyo loudly as she drove away, some chanting “Go home!”

The new president and his mother, the late former President Corazon Aquino, had called on Mrs. Arroyo to resign and joined street protests against her.

Mr. Aquino’s parents are revered for their opposition to the late dictator Ferdinand Marcos, who was ousted by a 1986 “people power” revolt. Considered a political lightweight, the 50-year-old bachelor won a landslide election victory that analysts attributed to his family name and anti-corruption platform.

Mr. Aquino has also anchored his campaign on restoring the credibility of the judiciary and Congress, which he says have been seriously eroded under Mrs. Arroyo’s rule.

The Philippines has been grappling with poverty, corruption, armed conflicts and deep divisions for decades. On the eve of his rise to the presidency, Mr. Aquino said he felt anxious but confident the millions who voted for him will back him to confront those problems.

A third of the 90 million population lives on a dollar a day, and about 3,000 Filipinos leave daily for jobs abroad. Mr. Aquino has also expressed alarm at the ballooning national budget deficit, which he said could surpass $8.7 billion this year.

Associated Press writers Jim Gomez and Teresa Cerojano contributed to this report.