English: Now, when we put here for x = x_(i), this will become 0, so this part is 0, and hence this part is 0 so the second part is 0.
Telugu: ఇప్పుడు, మనం ఇక్కడ x = x_(i) ఉంచినప్పుడు, ఇది 0 అవుతుంది.