Finding the angle between two bearings is often confusing.<ref>[https://stackoverflow.com/questions/16180595/find-the-angle-between-two-bearings]</ref>


;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 &nbsp; '''-180''' &nbsp; to &nbsp; '''+180''' &nbsp; degrees. 
<br>The &nbsp;result&nbsp; is also expressed in the range &nbsp; '''-180''' &nbsp; to &nbsp; '''+180''' &nbsp; 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. 


;Test cases:
*  -70099.74233810938   and   29840.67437876723
* -165313.6666297357    and   33693.9894517456
*    1174.8380510598456 and -154146.66490124757
*   60175.77306795546   and   42213.07192354373
<br><br>