What does the cryptic crossword clue "Unusual quotes in a maths book? (9)" mean?

The definition is "maths book?". The wordplay uses an anagram. anagram of QUOTES + IN + A = EQUATIONS; definition: "maths book?" The answer is EQUATIONS.

Unusual quotes in a maths book? (9)

Guardian Cryptic #25257 | 7 Down | 2011-02-28 flower

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