29 Sep
2019
29 Sep
'19
9:33 a.m.
Hi, atan(t)/2=sum((t^(-2*n-1)*(sqrt(sin(x)^2+t^2)-sin(x))^(2*n+1)*sin((2*n+1)*x))/(2*n+1),n=0..infinity); Best regards
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françois mendzina essomba2