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" If "1-(1)/(3)+(1)/(5)-(1)/(7)+(1)/(9)-...

" If "1-(1)/(3)+(1)/(5)-(1)/(7)+(1)/(9)-(1)/(11)+...oo=(pi)/(4)," then the value of "(1)/(1.3)+(1)/(5.7)+(1)/(9.11)+....oo" is "

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If 1-(1)/(3)+(1)/(5)-(1)/(7)+(1)/(9)-(1)/(11)+...=(pi)/(4), then value of (1)/(1xx3)+(1)/(5xx7)+(1)/(9xx11)+... is pi/8bpi/6c. pi/4d. pi/36

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