1. The problem statement, all variables and given/known data The problem is attached with this message. Here is the direct link of the image: http://picasaweb.google.ca/lh/photo/8QB5XydAGZP4jIXfej9lsw?authkey=x-xog63oZxw 2. Relevant equations for problem B I know I need to use Taylor's theorem. But I am not sure how to get started? 3. The attempt at a solution For problem A I think I need to assume 1/x=y and the y-> infinity, is this right direction? BTW Tan represents the principle branch of tangent function.