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In /\ABC prove that (r1)/(bc) + (r2)/(ca...

In `/_\ABC` prove that `(r_1)/(bc) + (r_2)/(ca) + (r_3)/(ab) = 1/r - 1/(2R)`.

A

` (1)/ (r ) +(1)/ ( R) `

B

` ( 1)/(r ) - ( 1)/( R ) `

C

` ( 1)/(r ) + I(1) /(2R) `

D

` ( 1) /( r ) - (1)/( 2 R ) `

Text Solution

Verified by Experts

The correct Answer is:
D
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