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Question
Prove that:
`("m"+"n")^-1("m"^-1+"n"^-1)=("m""n")^-1`
Sum
Solution
`"L"."H"."S". ("m"+"n")^-1("m"^-1+"n"^-1)`
`=1/("m"+"n")(1/"m"+1/"n")=1/("m"+"n").("n"+"m")/("m""n")=1/("m""n"`
`=("m""n")^-1`
`=R.H.S.`
Hence Proved.
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