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tan ""(A)/(2) + tan ""(B)/(2) + tan""(...

` tan ""(A)/(2) + tan ""(B)/(2) + tan""(C )/(2) =`

A

` (bc+ ca+ ab- s^(2))/( Delta ) `

B

` (bc+ ca+ ab)/( Delta ) `

C

` (bc+ ca+ ab+ s^(2) )/( Delta ) `

D

` (bc+ ca+ ab- s )/( Delta ) `

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A
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
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  11. If in Delta ABC the sides a,b,c are in A.P. Then

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