Final answer:
The participial phrase in the sentence is 'funded by three investors.' Participial phrases provide additional information about the subject.
Explanation:
The participial phrase in the sentence 'My cousin's new business, funded by three investors, is experiencing phenomenal success.' is 'funded by three investors.' Participial phrases are used to provide more information about the subject and typically start with a participle (verb form ending in -ing, -ed, -en, etc.) followed by any complements or modifiers.
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