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B Tan-1 to pi form?

  1. Apr 22, 2017 #1
    Hello, so while i was doing my own revision. When putting tan^-1(1/-√3) i receive the answer as -30. however, (im doing demovoier's theorem) in the revision book it says the answer should be 5π/6 .

    Help to brighten me? thanks.
  2. jcsd
  3. Apr 22, 2017 #2
    I think you are right because the principal value of arctan lies from -π/2 to π/2...
  4. Apr 22, 2017 #3
    make the calculation again but this time set the calculator in radians =D
    if you give the answer -pi/6 dont worry is the same as 5pi/6, because tan(-pi/6)=tan(5pi/6)=1/-√3=-√3/3
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