Answers for Section 4.2 #55-81 odd

4.2 #55: 0
4.2 #57: 12
4.2 #59: infinity
4.2 #61: 1
4.2 #63: 2
4.2 #65: 1
4.2 #67: 1
4.2 #69: -pi/2
4.2 #71: 0
4.2 #73: 0
4.2 #75: 0
4.2 #77: 0
4.2 #79: 1
4.2 #81: 0

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