Why do cellos and trombones sometimes use tenor clef?

In musical notation, instruments and voices are typically written in the clef that most closely corresponds to the range of their parts.

The tenor clef is a movable C clef that designates the second line from the top of the staff as middle C. It is used by instruments such as the cello, trombone, and bassoon because it is highly convenient for writing notes that frequently ascend into the higher registers of these instruments' ranges, which would otherwise require an excessive number of ledger lines if written in the bass clef.12

Historically, the use of the tenor clef for the trombone also stems from the instrument's origins in polyphonic music, where parts were traditionally written in the specific vocal clefs—alto, tenor, and bass—that matched the range of the individual instrument.3