\(\frac{x^2+y^2}{xy}=\frac{25}{12}\Leftrightarrow\frac{x}{y}+\frac{y}{x}=\frac{25}{12}\Leftrightarrow t+\frac{1}{t}=\frac{25}{12}\Leftrightarrow12t^2-25t+12=0\Leftrightarrow\int^{t=\frac{4}{3}\left(L\right)}_{t=\frac{3}{4}\left(TM\right)}\)
\(A=\frac{x-y}{x+y}=\frac{\frac{x}{y}-1}{\frac{x}{y}+1}=\frac{\frac{3}{4}-1}{\frac{3}{4}+1}=-\frac{1}{7}\)