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If s(r)=2+2r+2r^(2)+.....oo and "s(a)tim...

If `s(r)=2+2r+2r^(2)+.....oo and "s(a)times s(-a)=420`, where `a,r in(-1,1)`. Then the value of `(s(a)+s(-a))/(15)` is equal to

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