English: So, if you integrate this$(1 - \frac{x}{l})$ with respect to this here dx So, from 0 to l ; so, integration of this part will be integration of 1 will be x and integration of $\frac{x}{l}$ will be $\frac{x^{2}}{2l}$ and limits of integration are 0 to l . So, when we are putting l into this equation; I will get this part here and when I am putting 0 into this equation it will be 0 itself So, we are going to getting this part here after putting the limits of integration and if you see this it will be just $\frac{l}{2}$ So, will 1- $\frac{1}{2}$ remain only $\frac{1}{2}$; so, we are getting $\frac{1}{2}$ here.
Telugu: కాబట్టి, ఈ భాగం యొక్క ఇంటిగ్రేషన్, 1 యొక్క ఇంటిగ్రేషన్ x మరియు $\frac{x}{l}$ యొక్క ఇంటిగ్రేషన్ $\frac{x^{2}}{2l}$ పరిమితులు 0 నుండి l అవుతాయి.