# Elliptic Curve Point

i am doing this to find out Double point on elliptic . for prime field 5 if P=(0,3) 2P=(1,3)

```
K.<a>=GF(p^2);K.modulus()
R.<z>=PolynomialRing(K);
```

my resullt after performing point doubling is in the form of
i am getting P=(3*a)
and 2P= (z+3*a+4)
which is represent (4,3)
but i want (1,3) that is (z+3*a+1) how i will obtained