sstrike's answer to lana <3's Secondary 4 A Maths Singapore question.
the answer for j is 1/2 x^2 -2x + ln x + c
and the answer for k is 3ln x + 5/3 x -1/9 x^3 + c
and the answer for k is 3ln x + 5/3 x -1/9 x^3 + c
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