page646     Groups and subgroups      Matthias Lorentzen...mattegrisenforlag.com

Look at the picture beneath, then scroll down to the question and click the correct Answer button.

`pi/2`

×

Right answer

Close the window and click for the next page...

Close

• or

`pi`

×

Wrong answer

Close the window and try once more...

Close

• Click here for the next page