Science:Math Exam Resources/Courses/MATH105/April 2013/Question 01 (f)
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Question 01 (f) 

ShortAnswer Questions. Put your answer in the box provided but show your work also. Each question is worth 3 marks, but not all questions are of equal difficulty. If , find . 
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. 
Hint 1 

It is not necessary to calculate . Assume that we had the antiderivative of . Then we also know that Use the function to express . 
Hint 2 

Once, you used , we find
Do not forget to apply the chain rule by differentiating ! 
Checking a solution serves two purposes: helping you if, after having used all the hints, you still are stuck on the problem; or if you have solved the problem and would like to check your work.

Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. Since we don't want to calculate , we define the antiderivative of . This also means that . We use to express :
Now we can differentiate by using the chain rule
Note that is a constant for and cancels by differentiating. We use that we know , the derivative of , and find
Then, we apply ,
