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if-subtle-and-sin-sin-cos-cos-3-so-proof-sin-3-sin-3-0-




Question Number 20885 by tammi last updated on 06/Sep/17
if (θ−ϕ)subtle and   sin θ+sin ϕ=  (cos ϕ−cos θ)(√3)  so proof sin 3θ+sin 3ϕ=0
if(θφ)subtleandsinθ+sinφ=(cosφcosθ)3soproofsin3θ+sin3φ=0

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