Question: If + + = 180 and cot = cot + cot + cot , 0 < < 90

If α + β + γ = 180° and

cot θ = cot α + cot β + cot γ, 0 < θ < 90°

show that

sin3 θ = sin(α - θ) sin(β - θ) sin(γ – θ)

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