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# nathan

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207
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hello! Ok so I am trying to take the inverse tangent of 8/13 and both my calculator and this say its 31.60750, but my online math program is saying it's like 211. something. Do i have the settings wrong on my calculator

Guest Mar 30, 2017
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#1
+47
0

On your graphing calculator, you don't have it set up in degree mode.

Fox1018  Mar 30, 2017
#2
+6309
+2

Your settings are fine..but the tangent values repeat every time you add 180º

So the inverse tangent of 8/13 ≈ 31.607º and  31.607º + 180º = 211.607º

And you can keep adding 180º as many times as you want and the tangent of that angle will still be 8/13 .

hectictar  Mar 30, 2017
#3
+82721
+1

The result depends upon which quadrant the tangent lies

1st quadrant : arctan (8 / 13)    =  31.607502246249°

3rd quadrant :  the result in degrees  is  180 + 31.607502246349 =

211.607502246249°

CPhill  Mar 30, 2017

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