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| Math Central | Quandaries & Queries |
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Question from Sean, a parent: 1/1-cosine(2x) - 1/1+ cos(2x) |
Hi Sean,
You didn't give any instructions but I expect you want to simplify
\[\frac{1}{1 - \cos(2x)} - \frac{1}{1+\cos(2x}.\]
If so I would start with the first fraction and multiply the numerator and denominator by $1+\cos(2x)$ to get
\[\frac{1 + \cos(2x)}{(1 - \cos(2x))(1+\cos(2x))} = \frac{1 + \cos(2x)}{1-\cos^2(2x)}.\]
What about the second fraction?
Penny
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