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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

$${if}\:\left(\theta−\varphi\right){subtle}\:{and}\:\:\:\mathrm{sin}\:\theta+\mathrm{sin}\:\varphi= \\ $$$$\left(\mathrm{cos}\:\varphi−\mathrm{cos}\:\theta\right)\sqrt{\mathrm{3}} \\ $$$${so}\:{proof}\:\mathrm{sin}\:\mathrm{3}\theta+\mathrm{sin}\:\mathrm{3}\varphi=\mathrm{0} \\ $$

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