In \( \triangle \mathrm{ABC}, 2 \mathrm{R}^{2} \sin \mathrm{A} \sin...

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In \( \triangle \mathrm{ABC}, 2 \mathrm{R}^{2} \sin \mathrm{A} \sin \mathrm{B} \sin \mathrm{C}= \)
(VV)
(a) \( \mathrm{s}^{2} \)
(b) \( \mathrm{ab}+\mathrm{bc}+\mathrm{ca} \)
(c) \( \Delta \)
(d) zero
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