What is the proof that an area under a curve is the definite integral of that function? - Quora

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calculus - Why is the area under a curve the integral? - Mathematics Stack Exchange

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Why do integrals always have a dx?

calculus - Why is the area under a curve the integral? - Mathematics Stack Exchange

What is the proof that an area under a curve is the definite integral of that function? - Quora

integration - Proof that the area under a curve is the definite integral, without the fundamental theorem of calculus - Mathematics Stack Exchange

The Area under the Normal Curve is 1

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