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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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3+0 Answers

 #1
avatar+47 
0

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

Fox1018  Mar 30, 2017
 #2
avatar+4720 
+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 . smiley

hectictar  Mar 30, 2017
 #3
avatar+76959 
+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°

 

 

cool cool cool

CPhill  Mar 30, 2017

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