import ( "math/big" ) func main() { bytes := []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef} num := new(big.Int).SetBytes(bytes) fmt.Println(num) }In this example, the SetBytes method is used to create a big integer from a byte slice that represents the hexadecimal value "0123456789abcdef". This will result in a big integer containing the value 81985529216486895. Overall, the SetBytes method is a useful tool in the math/big package library for working with large numbers and binary data.