1.

y=2x^(2)-1, then (1)/(x^(2))+(1)/(2x^(4))+(1)/(3x^(6))+…….oo

Answer»

`-LOG((y-1)/(y+1))`
`-log((1+y)/(1-y))`
`-log((1-y)/(1+y))`
`-log((2+y)/(2-y))`

ANSWER :A


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