1.

If cos(α+β)sin(γ+δ)=cos(α−β)sin(γ−δ),provethatcotα cotβ cotγ=cotδ

Answer»

If cos(α+β)sin(γ+δ)=cos(αβ)sin(γδ),provethatcotα cotβ cotγ=cotδ



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