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In triangle ABC, ∠B=π3 and ∠C=π4. Let D divide BC internally in the ratio 1:3 and the angles ∠BAD=θ, ∠CAD=ϕ. The value of sin2ϕsin2θ=

Answer» In triangle ABC, B=π3 and C=π4. Let D divide BC internally in the ratio 1:3 and the angles BAD=θ, CAD=ϕ. The value of sin2ϕsin2θ=


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