2sin[(C+D)/2].sin[(DÂ-C)/2] is equal to – McqOptions

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1.	2sin[(C+D)/2].sin[(DÂ-C)/2] is equal to
A.	cosC + cosD
B.	cosC Â- cosD
C.	sinC Â- sinD
D.	sinC + sinD
Answer» C. sinC Â- sinD

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