So, ▽2square it is a problem in one dimension. So, ▽ each derivative of x is going to pull out one i k. So, if I were to simplify; I get this is equal to,
▽2एक डायमेंशन की समस्या है | अतः x का प्रत्येक ▽ डेरिवेटिव एक ik देता है | यदि मुझे इसे सरल करना हो तो मुझे मिलता है