In a \[\Delta ABC\] \[a,\ c,A\]are given and \[{{b}_{1}},\ {{b}_{2}}\]are two values of the third side b such that \[{{b}_{2}}=2{{b}_{1}}\]. Then \[\sin A=\]

\[\sqrt{\frac{9{{a}^{2}}+{{c}^{2}}}{8{{a}^{2}}}}\]

\[\sqrt{\frac{9{{a}^{2}}-{{c}^{2}}}{8{{a}^{2}}}}\]

\[\sqrt{\frac{9{{a}^{2}}-{{c}^{2}}}{8{{c}^{2}}}}\]

In a \[\Delta ABC\] \[a,\ c,A\]are given and \[{{b}_{1}},\ {{b}_{2}}\]

1.	In a \[\Delta ABC\] \[a,\ c,A\]are given and \[{{b}_{1}},\ {{b}_{2}}\]are two values of the third side b such that \[{{b}_{2}}=2{{b}_{1}}\]. Then \[\sin A=\]
A.	\[\sqrt{\frac{9{{a}^{2}}-{{c}^{2}}}{8{{a}^{2}}}}\]
B.	\[\sqrt{\frac{9{{a}^{2}}-{{c}^{2}}}{8{{c}^{2}}}}\]
C.	\[\sqrt{\frac{9{{a}^{2}}+{{c}^{2}}}{8{{a}^{2}}}}\]
D.	None of these
Answer» C. \[\sqrt{\frac{9{{a}^{2}}+{{c}^{2}}}{8{{a}^{2}}}}\]

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In a \[\Delta ABC\] \[a,\ c,A\]are given and \[{{b}_{1}},\ {{b}_{2}}\]are two values of the third side b such that \[{{b}_{2}}=2{{b}_{1}}\]. Then \[\sin A=\]

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