1.

यदि `x+1/x=sqrt(13)`, हो तो `3x//(x^(2)-1)` का मान क्या होगा?A. `3sqrt(13)`B. `(sqrt(13))/13`C. `1`D. `3`

Answer» Correct Answer - C
Given `=x+1/x=sqrt(13)`
than `=(3x)/(x^(2)-1)=3/(x-1/x)`………i
Now `x+1/x=sqrt(13)`
On squaring both side
`x^(2)+1/(x^(2))=13-2=11`
`x^(2)+1/(x^(2))-2=11-2`
`(x-1/x)^(2)=9=3^(2)`
`x-1/x=3`
Put this value in equation i
`=3/(x-1/x)=3/3=1`


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