009B Sample Midterm 1, Problem 4
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Evaluate the integral:
Foundations: 

1. Recall the trig identity: 
2. How would you integrate 


Solution:
Step 1: 

First, we write 

Using the identity we get 

If we use this identity, we have 

Step 2: 

Now, we use substitution. Let Then, Therefore, 

Final Answer: 
