Answer to 4.2.14 (a) :
The solution given in the book for this question is incorrect. You can solve the question as follows.Substitute 1-x = t. Then dx=-dt . Now the substituted integrand should look like this :
Now, integrating term by term, we'll get :
Taking out the common term, we get :
Now replacing t with 1-x, you'll get the answer as :
This should be the answer. The answer given on the book has a mistake.
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