Find the value of the cosine
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A fraction that is equivalent to 
will have the form 
, where A and B are equivalent and factors that are multiplied in.
The product fraction should be easily simplified using A and B to get the original fraction.
<em>In the case of your fraction </em>
you will need to find a fraction which is a product of this: 
The product fraction should be easily simplified using A and B to get the original fraction.
<em>In the case of your fraction </em>