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How to pronounce the triangle symbol (△X) in the derivative?
First, the origin of △x in the derivative

In mathematical analysis, delta x is introduced when defining derivative, which is expressed as the change (increment) of independent variable;

Second, read △

△ appears in the Greek alphabet. δ (uppercase), δ (lowercase), and the sound name δ? λ τ α, the Greek letter name is/? Eelta/, American English is delta (International Phonetic Alphabet /'d ε lt? /)。 So δx is pronounced δ X.