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Question
Expand : `(3"x"+1/(3"x"))^2`
Sum
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Solution
`(3"x"+1/(3"x"))^2=(3"x")^2+(1/(3"x")) ^2+2xx3"x"xx 1 /(3"x")`
`=9"x"^2+1/(9"x"^2)+2`
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Important Formula of Expansion
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