[SOLVED] Problem with Extremum in Function App

[CH3791]

Hello all,
I was plotting two simple cos and sin graphs when I came across a strange error. When I was finding Extremum from the Grapher in the Function App, it displayed the y coordinate as 0! The correct value should be 0.5. I have linked photos so you can see what I did.

First Photo
https://www.dropbox.com/s/erwx24h177d8nn...t.jpg?dl=0

Second Photo
https://www.dropbox.com/s/ulflgvs5krqz0g...d.jpg?dl=0

Third Photo
https://www.dropbox.com/s/do4mmnxiicrdl4...d.jpg?dl=0