Similarly, when P is between OBs, you can use OP 2+OE 2 = EP 2 to get E (0 0,2 √ 2-2).

To sum up, there are two E's that meet the requirements (0,2 √ 2-2) (0,4 √ 5-8). If you don't know them, you can chase them as soon as possible.

It's time for bed. The first question is too simple, and the analytical formula is y=-x+2.