$$\quad \frac { 49 } { 64 } x ^ { 2 } - 2 x y + \frac { 64 } { 49 } y ^ { 2 }$$
$\frac{\left(49x-64y\right)^{2}}{3136}$
$$\frac{2401x^{2}-6272xy+4096y^{2}}{3136}$$
$$\left(49x-64y\right)^{2}$$
$$\frac{\left(49x-64y\right)^{2}}{3136}$$
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