Crossword Genius

Mathematical statement converted into memorable hit briefly (8,7)

Ross

I believe the answer is:

binomial theorem

'mathematical statement' is the definition.
(type of mathematical formula)

'converted into memorable hit briefly' is the wordplay.
'converted' indicates anagramming the letters.
'briefly' means to remove the last letter.
'into'+'memorable'+'hit'='intomemorablehit'
'intomemorablehit' with its last letter removed is 'intomemorablehi'.
'intomemorablehi' anagrammed gives 'BINOMIAL THEOREM'.

I've seen this clue in The Times.
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