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Prove that : (r1)/(b c)+(r2)/(c a)+(r3)/...

Prove that : `(r_1)/(b c)+(r_2)/(c a)+(r_3)/(a b)=1/r-1/(2R)`

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ALLEN-SOLUTION AND PROPERTIES OF TRIANGLE-All Questions
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  3. Prove that : (r1)/(b c)+(r2)/(c a)+(r3)/(a b)=1/r-1/(2R)

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