x / x + a + y / x - a adalah
[tex] \frac{x}{ x+a } + \frac{y}{x - a} \\ \frac{x(x - a)}{(x + a)(x - a)} + \frac{y(x + a)}{(x - a)(x + a)} \\ \frac{ {x}^{2} - xa }{ {x}^{2} - {a}^{2} } + \frac{yx + ya}{ {x}^{2} - {a}^{2} } \\ \frac{ {x}^{2} - xa + yx + ya }{ {x}^{2} - {a}^{2} } \\ [/tex]
[answer.2.content]
