



 
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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