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The lecturer is saying

we write as f dash of x

when talk about this formula.

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I heard someone pronounce it as "prime" somewhere else.

Does single quote (') pronounce dash, prime or something else?

marked as duplicate by Jasper, Em. Aug 11 at 5:01

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An apostrophe is pronounced as "prime" in the context of calculus. The formula you mentioned would be pronounced as "f prime of x".

  • I didn't down vote you, but the lecturer seems like a reliable source of acceptable English. The duplicate post reports that "dash" is used in this context in some English-speaking regions. – Em. Aug 11 at 5:16

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