Dear Brainstormers,

After a quite long pause (the previous quiz was on November 2d), a new challenge is there as AQQ248:

A mathematician has created a special function that is defined in the integer set S from -9 to +9.

He disclose only few indications and values of that function:

The function is symmetric: F(-n) = F(n)

F(3) = 9

F(4) = 5

F(5) = 3

F(6) = 3

F(8) = -2

F(9) = -7

Question:

Can you crack that function and gives all the missing values (i.e. F(0); F(1); F(2) and F(7)?

Good luck!