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C4 Integration question

Could use some help with the attached question.

The part I am stuck on is (iii) specifically the integration of: 2r/(a^2 - r^2) ie. how to integrate with the a term on the bottom.

The answer is attached.
c4 integration.jpg47.0KB
answer.rtf205.0KB
Reply 1
Avatar for Pheylan
Pheylan
a is just a constant

what's ddr[ln(a2−r2)]\dfrac{d}{dr}[ln(a^2-r^2)] ?
Reply 2
Avatar for latslikeabat
latslikeabat
OP
If I take 'a' as a constant, I believe it is

Reply 3
Avatar for Pheylan
Pheylan
Original post by latslikeabat
If I take 'a' as a constant, I believe it is



how does that relate to your integrand?

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