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In a triangle A B C ,(r1+r2)/(1+cosC) is...

In a triangle `A B C ,(r_1+r_2)/(1+cosC)` is equal to `(2a b)/(c"Delta")` (b) `((a+b))/(c"Delta")` `(a b c)/(2"Delta")` (d) `(a b c)/("Delta"^2)`

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