English: So, I am going to set j = N, in which case ω_(N) will be equal to, And of course, if N is sufficiently large enough you could sort of say that in the limit when N is much greater than one, $\frac{N}{N + 1} \approx 1$, in which case this whole thing simply boils down to, $\frac{2T}{ma}(1 - cos\pi)$, and that is simply equal to 2.
Telugu: కాబట్టి, నేను j = N కి సమానం చేయబోతున్నాను, ఈ సందర్భంలో ω_(N) = $\frac{2T}{ma\ }\ (1 - Cos\ \frac{N\pi}{N + 1\ }$) ఉంటుంది.