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Let f(x) denote the sum of the infinite ...

Let f(x) denote the sum of the infinite trigonometric series
`f(x)=underset(n=1)overset(y)Sigma sin (2x)/(3^(n)) sin (x)/(3^(n))`
find f(x) (independent of n ) also evaluate the sum of the solutions of the equation f(x)=0 lying in the interval (0,629)

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