Let f(x) be defined such that f(−1) = 1 and f prime of x equals cos of the quantity 1 over x squared plus x comma where −2 < x < 1.

Part A: Find the tangent line approximation for f(−0.9). (25 points)

Part B: If f(−0.9) has an actual value of 1.3, use the shape of the graph to determine if this is an overestimate or underestimate. Justify your answer. (15 points)