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$l,m,n$  ক্রমিক সমানুপাতিক হলে, দেখাও যে, $\frac{l}{n}=\frac{l^2+m^2}{m^2+n^2}$

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দেওয়া আছে  $l,m,n$  ক্রমিক সমানুপাতিক।

অর্থাৎ, $\frac{l}{m}=\frac{m}{n}$ $\therefore m^2=ln$

 ডানপক্ষ,
$=\frac{l^2+m^2}{m^2+n^2}$

$=\frac{l^2+ln}{ln+n^2}$

$=\frac{l\left(l+n\right)}{n\left(l+n\right)}$

$=\frac{l}{n}$

$=$ বামপক্ষ

$\therefore \frac{l}{n}=\frac{l^2+m^2}{m^2+n^2}$ [দেখানো হলো]

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