MATH103 April 2014
• Q1 (a) • Q1 (b) i • Q1 (b) ii • Q1 (c) i • Q1 (c) ii • Q1 (c) iii • Q1 (d) i • Q1 (d) ii • Q1 (d) iii • Q1 (e) i • Q1 (e) ii • Q2 (a) • Q2 (b) • Q3 (a) • Q3 (b) • Q3 (c) • Q4 (a) • Q4 (b) • Q4 (c) • Q5 (a) • Q5 (b) • Q5 (c) • Q6 (a) • Q6 (c) • Q7 (a) • Q7 (b) • Q7 (c) • Q8 (a) • Q8 (b) • Q9 (a) • Q9 (b) • Q9 (c) • Q10 (a) • Q10 (b) • Q10 (c) • Q11 •
Question 04 (c)
Evaluate if it exists, or show that it does not exist, otherwise.
Work must be shown for full marks. Simplify fully.
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you?
If you are stuck, check the hints below. Read the first one and consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! If after a while you are still stuck, go for the next hint.
Use l’Hôpital’s rule.
Any product can be re-written as a ratio.
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First, write the product as a ratio:
Note that both the numerator and denominator in this ratio tend to as (since ). That is,
is an indeterminate form. Thus, we can apply l’Hôpital’s rule to get
Note: l’Hôpital’s rule is only applicable when its conditions are met by the numerator, the denominator, and even the ratio itself.
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MER QGH flag, MER QGQ flag, MER QGS flag, MER RT flag, MER Tag L'Hopital's rule