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Cos2 α – Cos2β – Cos2γ = ? If α + β + γ = 180 • Can you please help me with this problem?

Cos2α – Cos2β – Cos2γ = ? If α + β + γ = 180
 
Can you please help me with this problem?

Grade:11

1 Answers

Arun
25758 Points
4 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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