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

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

Prove that: ("cos"8Acos5A-cos12 Acos9A)/("sin"8Acos5A+cos12 Asin9A)=tan4A

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

Show that (cos8Acos5A-cos12Acos9A)/(sin8Acos5A+cos12Asin9A)=tan4A

Show that (cos 8Acos 5A-cos12Acos 9A)/(sin 8Acos 5A+cos 12Asin 9A)=tan 4A

(cos 8 A cos 5A-cos 12 A cos 9A)/(sin 8 A cos 5 A +cos 12Asin 9A)=

Show that (cos 8 A cos 5A - cos 12 A cos 9A )/( sin 8 A cos 5A + cos 12 A sin 9A ) = tan 4A

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: (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: (sin9A-sin7A)/(cos7A-cos9A) = cot8A