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অসীম ধারার অপেক্ষক
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A function $S$ is such that $S(r)=12+12r+12r^2+12r^3\dots\dots$ [$S$
The domain of S is all real numbers between $-1$ to $1$]
Given that $S(a)S(-a) = 2016$. find$S(a) + S(-a) =?$
Algebra
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