trigonometry

Question: If in $\Delta \,ABC$ , $2{{b}^{2}}={{a}^{2}}+{{c}^{2}},$ then $\frac{\sin 3B}{\sin B}=$

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

2) $\frac{{{c}^{2}}-{{a}^{2}}}{ca}$

3) ${{\left( \frac{{{c}^{2}}-{{a}^{2}}}{ca} \right)}^{2}}$

4) ${{\left( \frac{{{c}^{2}}-{{a}^{2}}}{2ca} \right)}^{2}}$

Solution:

Explanation: No Explanation

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