1.

If A+B+C+D= 2pi , " then " -4 cos""((A+B)/(2)) sin""((A+C)/(2)) cos""((A-D)/(2))=

Answer»

`SIN A + sin B+ sin C-sin D `
`sin A - sin B + sin C - sin D `
`sin A + sin B + sin C + sin D `
`sin A - sin B +sin C + sin D `

ANSWER :B


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