cos-1-43-3-pi-1-2-cos-1-43-3-2pi-2-2-cos-1-43-3-3pi-3-2-api-Find-a-

Question Number 136104 by Dwaipayan Shikari last updated on 18/Mar/21

\frac{c o s (1 + \sqrt{\frac{43}{3}}) π}{1^{2}} + \frac{c o s (1 + \sqrt{\frac{43}{3}}) 2 π}{2^{2}} + \frac{c o s (1 + \sqrt{\frac{43}{3}}) 3 π}{3^{2}} + \dots = a π

F i n d a