1.

हल कीजिए `"tan"^(-1)(x+1)+"tan"^(-1)(x-1)="tan"^(-1)8/31`

Answer» `"tan"^(-1)(x+1)+"tan"^(-1)(x-1)="tan"^(-1)8/31`
`"tan"^(-1)(x+1+x-1)/(1-(x+1)(x-1))="tan"^(-1)8/31`
`(2x)/(1-x^(2)+1)=8/31`
`x/(2-x^(2))=4/31`
`31x=8-4x^(2)`
`4x^(2)+31x-8=0`
`4x^(2)+32x-x-8=0`
`4x(x+8)-1(x+8)=0`
`(x+8)(4x-1)=0`
`x=-8, 1/4`


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