Its informative but too many errors
For example: in integration, the simpsons rule integral is x^3 and in the n-1 step they made it x^2 Answer should be 6 Many spelling errors. Many notation errors. Makes it kind of confusing and slows down the process but other than that it seems to be quite concise. I seem to learn much more efficiently from this than any other source? Weird. Thanks. 1$ worth it. Should add more