sinA/2. sin7A/2 + sin 3A/2. sin11A/2 =
sinA/2. sin7A/2 + sin 3A/2. sin11A/2 =
Sujay , 11 Years ago
Grade 12
Trigonometry> sinA/2. sin7A/2 + sin 3A/2. sin11A/2 =...
1 AnswersSujay
use 2sinAsinB = cos(A_B)-cos(A+B)
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