# Prove: (SinX+Sin2X+ Sin3X+ Sin4X+ Sin5X)/ (CosX+ Cos2X+ Cos3X+ Cos4X+ Cos5X)=tan3X?

Can anyone prove: (SinX+Sin2X+ Sin3X+ Sin4X+ Sin5X)/ (CosX+ Cos2X+ Cos3X+ Cos4X+ Cos5X)=tan3X

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