Q. 2sin[(C+D)/2].sin[(D-C)/2] is equal to
A) cosC - cosD
B) cosC + cosD
C) sinC + sinD
D) sinC - sinD
✔ Correct Answer: cosC - cosD
Exam Insight
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A) cosC - cosD
B) cosC + cosD
C) sinC + sinD
D) sinC - sinD
✔ Correct Answer: cosC - cosD
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