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