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Prove that: ("cos"8Acos5A-cos12 Acos9A)/...

Prove that: `("cos"8Acos5A-cos12 Acos9A)/("sin"8Acos5A+cos12 As in9A)=tan4A`

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To prove the equation \[ \frac{\cos 8A \cos 5A - \cos 12A \cos 9A}{\sin 8A \cos 5A + \cos 12A \sin 9A} = \tan 4A, \] we will follow these steps: ...
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