Right-angled triangle: sin of the difference of the other two angles in terms of the sides

1. A.
   $\dfrac{a^2 - c^2}{a^2 + c^2}$
2. B.
   $\dfrac{c^2 - a^2}{c^2 + a^2}$
3. C.
   $\dfrac{b^2 - c^2}{b^2 + c^2}$
4. D.
   $\dfrac{c^2 - b^2}{c^2 + b^2}$

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1. A.
   $\dfrac{a^2+b^2}{a^2-b^2}$
2. B.
   $\dfrac{a^2+c^2}{a^2-c^2}$
3. C.
   $\dfrac{b^2+c^2}{b^2-c^2}$
4. D.
   $\dfrac{a^2-b^2}{a^2+b^2}$

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