((cos(1+(√((43)/3)))π)/1^2 )+((cos(1+(√((43)/3)))2π)/2^2 )+((cos(1+(√((43)/3)))3π)/3^2 )+...=aπ Find a


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

$\frac{c o s (1 + \sqrt{\frac{43}{3}}) π}{1^{2}} + \frac{c o s (1 + \sqrt{\frac{43}{3}}) 2 π}{2^{2}} + \frac{c o s (1 + \sqrt{\frac{43}{3}}) 3 π}{3^{2}} + . . . = a π$ $F i n d a$
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