Science:Math Exam Resources/Courses/MATH103/April 2010/Question 05 (b)
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Question 05 (b) 

In this problem, you are asked to find a value for the integral in two different ways. (b) Use the Taylor series for the function to write down a Taylor Series approximation for and find an approximation to the integral using the first 3 terms of that series. (Leave your answer in terms of the three fractions, i.e. you need not compute a simplified fraction nor a decimal approximation. Some factorial values that may be useful: , , , , , . 
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 hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

The Taylor series expansion of cosine is

Checking a solution serves two purposes: helping you if, after having used the hint, 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. Via the hint we have that
multiplying by x gives
and then integrating gives
Taking into account the end points, we have
and simplifying and using only the first three terms, we have
completing the question 