cos(47) ≈ 0.68
cos(13) ≈ 0.97
sin(47) ≈ 0.73
sin(13) ≈ 0.25

Therefore, the calculation would be:
0.68 0.97 - 0.73 0.25
0.6596 - 0.1825
= 0.4771

So, cos(47) × cos(13) − sin(47) × sin(13) is approximately 0.4771.