[align=left]Sum:n=0--> ∞ [ P^n Cos(nӨ) ] = [ (1 - P Cos(Ө))/(1 – 2 P Cos(Ө) +P^2)]
Prove it . its Optics Theory
Sum:n=0-->∞ [Cos(nӨ)] = [ Sin(NӨ/2) / Sin(Ө/2)]. Cos((N-1)Ө/2)
Prove it. Its Optics Theory[/align]
دمتم برعاية الله.gif "Eh S (19)")
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[align=left]Sum:n=0--> ∞ [ P^n Cos(nӨ) ] = [ (1 - P Cos(Ө))/(1 – 2 P Cos(Ө) +P^2)]
Prove it . its Optics Theory
Sum:n=0-->∞ [Cos(nӨ)] = [ Sin(NӨ/2) / Sin(Ө/2)]. Cos((N-1)Ө/2)
Prove it. Its Optics Theory[/align]
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