The Integral Calculus series starts with the antiderivative or indefinite integral. These lessons made sense. However, the series then jumps immediately into using definite integrals without defining or introducing them.
I started pre-calculus , differentials calculus , things were going fine .... I'm totally stuck at definite integrals as things feel out of sequence .
Many comments suggest watching youtube videos , but I can't figure it out ..
I think lot of introductory part is missing ...