Use the following information to complete parts a. and b. below. f ( x ) = 9/1 + x; approximate V1. 15 a. Find the first four nonzero terms of the Taylor series centered at 0 for the given function The first term is The second term is The third term is The fourth term is b. Use the first four terms of the series to approximate the given quantity. 91. 15 ~ (Round to three decimal places as needed.)