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(sin A+sin5A+sin9A)/(cos A+cos5A+cos9A)=...

(sin A+sin5A+sin9A)/(cos A+cos5A+cos9A)=

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Show that : (frac(sinA+sin5A+sin9A)(cosA+cos5A+cos9A))=tan5A

( sin A + sin 5A + sin 9A)/( cos A + cos 5A + cos 9A)=

(sin A-sin5A+sin9A-sin13A)/(cos A-cos5A-cos9A+cos13A)=cot4A

(sin A-sin5A+sin9A-sin13A)/(cos A-cos5A-cos9A+cos13A)=cot4A

Prove that: (sin3A+sin5A +sin7A+sin9A)/(cos3A+cos5A+cos7A+cos9A)=tan6A

(sin3A+sin5A+sin7A+sin9A)/(cos3A+cos5A+cos7A+cos9A)

(sin3A+sin5A+sin7A+sin9A)/(cos3A+cos5A+cos7A+cos9A)=tan6A

(sin A+sin3A+sin5A+sin7A)/(cos A+cos3A+cos5A+cos7A)=tan4A

Prove that: (sin7A+sin5A+sin9A+sin3A)/(cos3A+cos5A+cos7A+cos9A)= tan6A

Prove that: (sin7A+sin5A+sin9A+sin3A)/(cos3A+cos5A+cos7A+cos9A)= tan6A