This (free) educational project has been created by Laurin Gschnitzer (15 years of age).
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Long-Videos

Full-length lessons. Search for a topic — matching videos move to the top and get highlighted, everything else fades out.

50 examples for trigonometric integration

A full walkthrough of fifty worked integrals involving sine, cosine, tangent and their powers.

trigonometryintegrationcalculusmathematics