Science:Math Exam Resources/Courses/MATH105/April 2015/Question 01 (h)
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Question 01 (h) 

Evaluate . 
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 

Consider performing a trigonometric substitution (think about the trigonometric identity you might want to use). 
Hint 2 

Consider performing a substitution of the form for some constant . Note that . 
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 1 

Found a typo? Is this solution unclear? Let us know here.
Please rate my easiness! It's quick and helps everyone guide their studies. Following the hints, we perform the substitution As it follows that Hence 
Solution 2 

Found a typo? Is this solution unclear? Let us know here.
Please rate my easiness! It's quick and helps everyone guide their studies. We may also use the hyperbolic substitution (note that ). So the answer is simply Note that this is equivalent to the previous solution, as 