trigonometry

Question: In $\Delta ABC,\frac{\sin (A-B)}{\sin (A+B)}=$

1) $\frac{{{a}^{2}}-{{b}^{2}}}{{{c}^{2}}}$

2) $\frac{{{a}^{2}}+{{b}^{2}}}{{{c}^{2}}}$

3) $\frac{{{c}^{2}}}{{{a}^{2}}-{{b}^{2}}}$

4) $\frac{{{c}^{2}}}{{{a}^{2}}+{{b}^{2}}}$

Solution:

Explanation: No Explanation

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