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Math 2 Formulas

eagertolearneagertolearn Posts: 369Registered User Member
Do we need to know them? I think double angle formulas would come in handy, but what about half angles and sum/diff formulas?
Post edited by eagertolearn on

Replies to: Math 2 Formulas

  • eagertolearneagertolearn Posts: 369Registered User Member
    bump 10 char. Please answer! It's a very simple question...
  • 314159265314159265 Posts: 4,276Registered User Senior Member
    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).
  • eagertolearneagertolearn Posts: 369Registered User Member
    haha I already programmed double angle stuff into my calc...
    thank you!
  • GreedIsGoodGreedIsGood Posts: 2,039Registered User Senior Member
    why would you need that.

    Sin (47) => use calculator
    Sin (A+B) => sinAcosB+sinBcosA
  • eagertolearneagertolearn Posts: 369Registered User Member
    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.
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