El area es la parte azul menos la naranja; the area is the blue part minus the orange. Except, if b<a, then the blue areas (above the x-axis) count as negative, and the orange areas (below the x-axis) count as positive.
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Y la primitiva F de f; And the "primitive" (antiderivative) of f is F:
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I added the b> to the x>a expression for F, so it draws the area-so-far as we increase b.
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Based on "Integral de cualquier f(x)" by Solin; modified to work for b<a, and added the difference-quotient-of-F graph.
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equals
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equals
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equals
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