(s + t + u) ≠ 0 అయితే, \(\frac{s^2+t^2+2 s t-u^2}{s^2-t^2-2 t u-u^2}\) సూచించబడిన సూత్రాన్ని సూక్ష్మీకరించండి?

1
\(\frac{s+t-u}{s-t-u}\)
2
\(\frac{s+t+u}{s-t+u}\)
3
\(\frac{s-t-u}{s+t-u}\)
4
\(\frac{s-t+u}{s+t+u}\)

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