The function f (x, y) = arctan(x + 2y) can be approximated by the linear function L(x, y) = ax + by + c in a neighbourhood of the point (1, 0). Calculate a, b and c and enter the solution below with up to 3 decimal places, 9.9. \"4.598" or "6.667". Value of a: E] N Value of b: D Value of c: :l