\(\cfrac{3x-5y}{3x+5y}=\cfrac{1}{2}\) হলে, \(\cfrac{3x^2-5y^2}{3x^2+5y^2} \) এর মান নির্ণয় করি ।
\(\cfrac{3x-5y}{3x+5y}=\cfrac{1}{2}\)
বা, \(6x-10y=3x+5y\)
বা, \(6x-3x=5y+10y\)
বা, \(x=\cfrac{15y}{3}=5y\)
∴\(\cfrac{3x^2-5y^2}{3x^2+5y^2}\)
\(=\cfrac{3(5y)^2-5y^2}{(3(5y)^2+5y^2}\)
\(=\cfrac{70y^2}{80y^2}=\cfrac{7}{8}\) (Answer)