import ( "fmt" "math/big" ) func main() { // create a big integer value val := big.NewInt(10) // use Neg method to get the negative value of val negVal := new(big.Int).Neg(val) fmt.Println("Original Value:", val) fmt.Println("Negative Value:", negVal) }In this example, we create a big integer value of 10 using the `big.NewInt` function. Then, we use the `Neg` method to get the negative value of the big integer and store it in a variable called `negVal`. Finally, we print out both the original and negative values using `fmt.Println`. The `big` package library is used in this example, as that is where the `NewInt` and `Neg` functions are defined.