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If 1-1/3+1/5-1/7+1/9-1/(11)+=pi/4 , then...

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//8` b. `pi//6` c. `pi//4` d. `pi//36`

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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
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