005 Sample Final A, Question 14

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Question Prove the following identity,

1) What can you multiply by to obtain a formula that is equivalent to something involving ?
1) You can multiply by Failed to parse (syntax error): {\displaystyle \frac{1 + \sin(\theta)}{\1 + \sin(\theta)}}
Step 1:
We start with the left hand side. We have .
Step 2:
Simplifying, we get .
Step 3:
Since , we have

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