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" 10."(sin A sin2A+sin3A sin6A+sin4A sin...

" 10."(sin A sin2A+sin3A sin6A+sin4A sin13A)/(sin A cos2A+sin3A cos6A+sin4A cos13A)=tan9A

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Prove that (sinA+sin2A+sin4A+sin5A)/(cos A+cos2A+cos 4A+cos5A)=tan3A .

Prove that (sinA+sin2A+sin4A+sin5A)/(cos A+cos2A+cos 4A+cos5A)=tan3A .

Prove that (sinA+sin2A+sin4A+sin5A)/(cos A+cos2A+cos 4A+cos5A)=tan3A .

Prove that (sinA+sin2A+sin4A+sin5A)/(cos A+cos2A+cos 4A+cos5A)=tan3A .