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sinA/2. sin7A/2 + sin 3A/2. sin11A/2 =

sinA/2. sin7A/2 + sin 3A/2. sin11A/2 = 

Grade:12

1 Answers

Sujay
18 Points
9 years ago
use 2sinAsinB = cos(A_B)-cos(A+B)

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