method?

This is taught in high school - or at least it was for me back in the day.

See http://www.bced.gov.bc.ca/irp/pdfs/mathematics/WNCPmath1012/2008math_precalc12.pdf Learning goal B10 goal 10.1

So I'd expect they have seen this before.

CarmenBruni (talk)‎03:27, 24 November 2013

Since solution 2 doesn't rely on this trick as heavily any more, I think it's okay as is now.

Bernhard Konrad (talk)‎04:06, 24 November 2013
 
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