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यदि `m^(4)+1/(m^(4))=119` है तो `m-1/m=?`A. `+-3`B. `4`C. `+-2`D. `+-1`

Answer» Correct Answer - A
`m^(4)+1/(m^(4))=119`
`m^(4)+1/(m^(4))+2=119+2`
`(m^(2)+1/(m^(2)))^(2)=121`
`m^(2)+1/(m^(2))=11`
`m^(2)+1/(m^(2))-2=11-2`
`(m-1/m)^(2)=9`
`m-1/m=+-3`


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