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Which of the following holds good for any triangle \( A B C \) ?
(A) \( \frac{\cos A}{a}+\frac{\cos B}{b}+\frac{\cos C}{c}=\frac{a^{2}+b^{2}+c^{2}}{2 a b c} \)
(B) \( \frac{\sin A}{a}+\frac{\sin B}{b}+\frac{\sin C}{c}=\frac{3}{2 R} \)
(C) \( \frac{\cos A}{a}=\frac{\cos B}{b}=\frac{\cos C}{c} \)
(D) \( \frac{\sin 2 A}{a^{2}}=\frac{\sin 2 B}{b^{2}}=\frac{\sin 2 C}{c^{2}} \)
\( \mathrm{P} \)
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