1.

If in a Delta ABC, a, b, care in A.P . Thencos ((A- C)/( 2))is equal to

Answer»

` ( 1)/ (2)SIN ""( B)/(2) `
`2 sin "" (B)/2`
` (1)/(3)sin ""( B)/(2) - 4 `
` 3 sin ""( B)/(2) `

ANSWER :B


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