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JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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In a Δ ABC,  r1bc  +  r2ca  +  r3ab\Delta \,ABC,\,\,\frac{{{r_1}}}{{bc}}\,\, + \,\,\frac{{{r_2}}}{{ca}}\,\, + \,\,\frac{{{r_3}}}{{ab}} is equal to
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Correct option: D
1r−12R\frac{1}{r} - \frac{1}{{2R}}
Option D (1r−12R\frac{1}{r} - \frac{1}{{2R}}) is correct because it is the simplified form of the given expression using trigonometric identities and the properties of triangles.

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