[Bugs] #2697 UNSP: Calculate should use an appropriate number of significant figures for trigonometric functions

[Sugar Labs Bugs]

#2697: Calculate should use an appropriate number of significant figures for
trigonometric functions
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    Reporter:  greenfeld                  |          Owner:  rwh                        
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  0.92.x                     
    Severity:  Minor                      |       Keywords:                             
Status_field:  New                        |   Distribution:  OLPC                       
   Seeta_dev:                             |  
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 Calculate should use an appropriate number of significant figures for
 trigonometric functions.  Right now it provides errors in the noise where
 it should provide a zero answer.

 This potentially could confuse students if none of their other figures are
 that minuscule.  Seen in Calculate-36 in OLPC 11.2.0 os13.

 Examples seen on an XO-1.5 (using degrees; radians are similar):
  * sin(180) = 1.22460*10^-16^
  * cos(90) = 6.12303*10^-17^
  * tan(90) = 1.63317*10^16^ {technically I believe this is undefined, but
 Google's calculator makes the same mistake for this one entry}.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2697>
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