In 7-10, use the results in Examples 2 and 3. Use the identity cos z= sin(7T/2 -z) to
Chapter 20, Problem 7(choose chapter or problem)
In 7-10, use the results in Examples 2 and 3. Use the identity cos z= sin(7T/2 -z) to find the image of the strip 0 ::5 x ::5 7T under the complex mapping w = cos z. What is the image of a horizontal line in the strip?
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