What does the cryptic crossword clue "Function of powerful whip cracking (9)" mean?

The definition is "Function". The wordplay uses a container (one word inside another). TAN (synonym="=whip, flog") in COGENT (synonym="=powerful, convincing, of an argument") = COTANGENT; definition: "Function" The answer is COTANGENT.

Function of powerful whip cracking (9)

Independent Cryptic #11946 | 17 Down | 2025-01-22 flower

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