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प्रश्न
If `3"x"-1/(3"x")=5`, find : `9"x"^2+1/(9"x"^2)`
योग
उत्तर
`9"x"^2+1/(9"x"^2)=(3"x"-1/(3"x"))^2+2`
= (5)2 + 2
= 25 + 2
= 27
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