In the ambiguous case, if \( a, b \) and \( A \) are given and \( c_{1}, c_{2} \) are two values...

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In the ambiguous case, if \( a, b \) and \( A \) are given and \( c_{1}, c_{2} \) are two values of the third side \( c_{\text {, then }} \)
\[
c_{1}{ }^{2}-2 q_{1} c_{2} \cos 2 A+c_{2}{ }^{2}=
\]
(A) \( 4 a^{2} \cos ^{2} A \)
(B) \( 4 a^{2} \cos A \)
(C) \( 4 a \cos ^{2} A \)
(D) none of these
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