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If alpha,beta,gammain(0,pi/2), then (sin...

If `alpha,beta,gammain(0,pi/2)`, then `(sin(alpha+beta+gamma))/(sinalpha+sinbeta+singamma)` is

A

`4cos^2((alpha-beta)/2)`

B

`4sin^2((alpha-beta)/2)`

C

`4cos^2((alpha+beta)/2)`

D

`4sin^2((alpha+beta)/2)`

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