Cos2α – Cos2β – Cos2γ = ? If α + β + γ = 180• Can you please help me with this problem?
Mihaela , 6 Years ago
Grade 11
Trigonometry> Cos2 α – Cos2β – Cos2γ = ? If α + β + γ =...
1 Answers
Arun
Last Activity: 6 Years ago
Dear student
2sin (A+ B) sin (B-A) - cos 2c
2 sinc sin (B-A) - 1 + 2 sin²c
2 sinC ( sin (B-A) + sin (A+B)) -1
4 sin C sin A cos B -1
Hope it helps
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