Low FH's answer to Sally Tan's Junior College 1 H2 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Low FH
Low Fh's answer
2 answers (Tutor Details)
1st
Give you a hint.

For part i) use method of difference

ii) how do you think the expression in part i is related to the question in part ii)? Hint: calculus