Answer :
Adding (i) and (ii):
When x = 0 ⇒ y = tan 0 = 0
OR
Therefore,
cos πx > 0
⇒ x cos πx > 0
⇒ |x cos πx| = x cos πx
cos πx < 0
⇒ x cos πx < 0
⇒ |x cos πx| = -x cos πx
So,
Using integration by parts:
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