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Fundamental theorem of calculus and definite integrals

Recognise the definite integral ∫ 𝑓(𝑥)𝑏 𝑎  𝑑𝑥 as a limit of sums of the form ∑ 𝑓(𝑥𝑖) 𝛿𝑥𝑖𝑖.

mm-u4-t1-s1-d2

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