zhu jiasheng's answer to Chua Xiang Ning's Junior College 1 H2 Maths question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
zhu jiasheng
Zhu Jiasheng's answer
25 answers (Tutor Details)
1st
Partial fraction, Integration by substitution, combining ln, see that arctan(1)=pi/4