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Question
If `3"x"-1/(3"x")=5`, find : `9"x"^2+1/(9"x"^2)`
Sum
Solution
`9"x"^2+1/(9"x"^2)=(3"x"-1/(3"x"))^2+2`
= (5)2 + 2
= 25 + 2
= 27
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