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Prove that (cos 9^(@)+ sin 9^(@))/(cos...

Prove that
`(cos 9^(@)+ sin 9^(@))/(cos 9^(@) -sin 9^(@)) = tan 54^(@)`

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To prove that \[ \frac{\cos 9^\circ + \sin 9^\circ}{\cos 9^\circ - \sin 9^\circ} = \tan 54^\circ, \] we will start with the left-hand side (LHS) and manipulate it step by step. ...
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