How Sin (A+B) × Sin (A-B) = Sin²A - Sin²B ?
How Sin (A+B) × Sin (A-B) = Sin²A - Sin²B ? ➡ Sin(A+B) = SinA CosB + CosA SinB ➡ Sin(A-B) = SinA CosB - CosA SinB
Posts
How Cos 2θ = (1 - tan²θ)/ (1 + tan²θ) ?
How Cos 2θ = (1 - tan²θ)/ (1 + tan²θ) ? ➡ Cos(2A) = Cos²A - Sin²A
How tan (3A) = (3tanA - tan³A)/(1-3tan²A)?
How tan (3A) = (3tanA - tan³A)/(1-3tan²A)? 👉 How tan(A+B) = (tanA + tanB)/(1- tanA tanB ) ?
How tan (2A) = (2 tan A)/ (1- tan²A) ?
How tan (2A) = (2 tan A)/ 1- tan²A? ➡ How tan(A+B) = (tanA + tanB)/(1- tanA tanB ) ?
