I don't know the Windows 10 calculator. Do this to check your calculations:
Get the answer for: cos(180)
If the answer is -0.59846006... the calculator expects radians in which case you should use (bearing*pi/180) instead of bearing.
If the calculator expected degrees then the answer would be -1, in which case do nothing.
Secondly, UTM coordinates are in metres right? Try using your range as is, in those formulas (instead of dividing by 10). See of that makes a difference.