[" 103.Prove that "],[qquad cos A cos2A cos4A cos8A=(sin16A)/(16.sin A)]

Prove that cos A cos 2A cos 4A cos 8A= (sin 16A)/(16 sin A) .

cos x cos 2x cos 4x cos 8x =(sin 16x)/(16sin x)

If A is not an integral multiple of (pi) , prove that cos A cos 2A cos 4A cos 8A =(sin 16A)/(16 sin A) Hence deduce that cos. (2pi)/(15). Cos. (4pi)/(15) .cos. (8pi)/(18). Cos. (16pi)/(15)=(1)/(16)

prove that cos x cos2x cos4x cos8x=(sin16x)/(16sin x)

Prove that: (cos 2A cos 3A -cos 2A cos 7A + cos A cos 10A)/("sin" 4A sin 3A - sin 2A sin 5A + sin 4A sin 7A) = cot 6A cot 5A

Prove that (1 + sin2A) / (cos2A) = (cos A + sin A) / (cos A-sin A)

Prove that: (cos 2A cos 3A-cos 2A cos 7A + cos A cos 10A)/(sin 4A sin 3A -sin 2A sin 5A + sin 4A sin 7A)= cot 6A cot 5A .

Prove that: (cos8A cos5A-cos12A cos9A)/(sin8A cos5A+cos12A sin9A)=tan4A

Prove that: \ cos7^0cos 14^0cos 28^0cos 56^0=(sin 68^0)/(16cos83^0)

Prove that cos 2 0^(@)cos4 0^(@)cos6 0^(@)cos8 0^(@)=1/16