can someone please explain to me for the third table how did they get those numbers for cos(c)

Use the data collected to compute the table below. Triangle cos(C) a2 + 6 2 - c ? ) % Difference 2ab Error -0.292 -0.191 -41.74 2 0.719 0.628 13.673. Verify the Law of Sines: Use the data collected above to fill out the Table below Triangle a/sin(A) b/sin(B) c/sin(C) Average Range (min, max) 1 1.37 2.08 2.23 2.06 (1.87, 2.23) 2 1.37 1.33 1.54 1.41 (1.37, 1.54)Table 0: Triangle Data Collection Triangle a b C Angle A Angle B Angle C 1 1.37m 1.39m 2.13m 42 42 96 2 1.37m 0.89m 1.067m 90 420 440