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;Task:
Find the angle which is the result of the subtraction '''b2 - b1''', where '''b1''' and '''b2''' are the bearings.
<br>Input bearings are expressed in the range '''-180''' to '''+180''' degrees.
<br>The result is also expressed in the range '''-180''' to '''+180''' degrees.
Compute the angle for the following pairs:
::* 20 degrees ('''b1''') and 45 degrees ('''b2''')
::* -45 and 45
::* -85 and 90
::* -95 and 90
::* -45 and 125
::* -45 and 145
::* 29.4803 and -88.6381
::* -78.3251 and -159.036
;Optional extra: allow the input bearings to be any (finite) value.
Allow the input bearings to be any (finite) value.
;Test cases:
::* -70099.74233810938 and 29840.67437876723
::* -165313.6666297357 and 33693.9894517456
::* 1174.8380510598456 and -154146.66490124757
::* 60175.77306795546 and 42213.07192354373
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