In a \( \triangle \mathrm{ABC} \), the line segments \( \mathrm{AD}, \mathrm{BE} \) and \( \math... VIDEO
In a \( \triangle \mathrm{ABC} \), the line segments \( \mathrm{AD}, \mathrm{BE} \) and \( \mathrm{CF} \) are three altitudes. If \( \mathrm{R} \) is the circumradius of the \( \triangle \mathrm{ABC} \), a side of the \( \triangle \mathrm{DEF} \) will be
(a) \( R \sin 2 \mathrm{~A} \)
(b) \( \operatorname{ccos} B \)
(c) \( \operatorname{asin} A \)
(d) bcos B
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