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Show that beta=2prop where symbols have ...

Show that `beta=2prop` where symbols have their usual meaning.

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Let 'L' be the length of the metal and 'B' be its breadth. Area `A_0=LB`
After expansion,
`A'=(L+/_\L)(B+/_\B)`
i.e, `A'=LB+L/_\B+B/_\L+/_\L/_\B`
`A'-A=L/_\B+B/_\L+/_\L/_\B`
i.e `A'-A=LpropB/_\T+BpropL/_\T,/_\L/_\B`-can be neglected
i.e., `(A'-A)/(A/_\T)=2prop`
`:.beta=(A'-A)/(A/_\T)=2prop`
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