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 10-04-2010, 02:55 PM #1 Member   Join Date: Jun 2010 Location: Duke '15 Posts: 361 Math 2 Formulas Do we need to know them? I think double angle formulas would come in handy, but what about half angles and sum/diff formulas? Reply
 10-04-2010, 09:01 PM #2 Member   Join Date: Jun 2010 Location: Duke '15 Posts: 361 bump 10 char. Please answer! It's a very simple question... Reply
 10-04-2010, 09:55 PM #3 Senior Member   Join Date: Jan 2010 Location: Yale 2016 Posts: 3,549 I don't recall any half angle or sum/difference questions on the June 2010 test. If you're paranoid, you could always store them in your calculator (or use a calculator with a CAS (e.g. the TI-89) and have the calculator spit out the formula). Reply
 10-04-2010, 10:24 PM #4 Member   Join Date: Jun 2010 Location: Duke '15 Posts: 361 haha I already programmed double angle stuff into my calc... thank you! Reply
 10-05-2010, 08:49 PM #5 Senior Member   Join Date: Jul 2010 Location: New York Posts: 1,912 why would you need that. Sin (47) => use calculator Sin (A+B) => sinAcosB+sinBcosA Reply
 10-05-2010, 10:41 PM #6 Member   Join Date: Jun 2010 Location: Duke '15 Posts: 361 because....you either memorize it (which i already did ages ago) or you just plug it into your calculator if you don't know it or you do both to be safe. Reply

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