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20 13 postgraduate entrance examination mathematics integral derivative problem! Find the derivation process!
Original formula =∫dx/(a-x)(a+x)

= 1/2a∫( 1/a+x)+( 1/x-a)dx

= 1/2 AlN[a+x]- 1/2 AlN[ 1/x-a]

= 1/2aln[a+x/a-x]

Here [] is the absolute value.

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