Best tutorials for the Methods of integrals calculation

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1) Most of the students have difficulty with the calculus & integrations. Including me.
But after long searching I found these tutorials files about the integrals methods & techniques on studypool.

2) You can check the links below ( look the preview ) :

https://www.studypool.com/documents/713 ... ion-part-1

https://www.studypool.com/documents/813 ... 2-calculus

3) This is the best explanation for the integrals methods with examples, step by step. It helped me a lot & I hope if you check these files tell us your opinion & if you find files similar to these files kindly, share it with us .