In \( \triangle A B C(a+b)(a-b)=c(b+c) \). The measure of angle \( A \), is (A) \( 30^{\circ} \)...
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0In \( \triangle A B C(a+b)(a-b)=c(b+c) \). The measure of angle \( A \), is
(A) \( 30^{\circ} \)
(B) \( 90^{2} \)
(C) \( 60^{\circ} \)
(D) \( 120^{\circ} \)
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