- #1

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## Summary:

- I've read more than one time the guideline, but not obtained the result related to ##\pi##

Hi PF, hope to be publishing in the right forum

<moderator's note: moved to the right forum >

##\arccos{\dfrac{\sqrt{2}}{2}}\mbox{rad}=\dfrac{\pi}{4}\mbox{rad}##

This is a trigonometric true, but I've read the steps in my guideline, and I don't manage. The calculator is a chinese Kooltech CPC-400N, an imitation of Casio fx-82MS. It should work similarly.

I enter the data, and the result is 0,785398163. Right, but, how could I obtain ##\dfrac{\pi}{4}##?

Greetings!

<moderator's note: moved to the right forum >

##\arccos{\dfrac{\sqrt{2}}{2}}\mbox{rad}=\dfrac{\pi}{4}\mbox{rad}##

This is a trigonometric true, but I've read the steps in my guideline, and I don't manage. The calculator is a chinese Kooltech CPC-400N, an imitation of Casio fx-82MS. It should work similarly.

I enter the data, and the result is 0,785398163. Right, but, how could I obtain ##\dfrac{\pi}{4}##?

Greetings!