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Prove that: (cos^(3)A-cos3A)/(cosA)+(s...

Prove that:
`(cos^(3)A-cos3A)/(cosA)+(sin^(3)A+sin3A)/(sinA)=3`

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To prove the equation \[ \frac{\cos^3 A - \cos 3A}{\cos A} + \frac{\sin^3 A + \sin 3A}{\sin A} = 3, \] we will use the trigonometric identities for \(\cos 3A\) and \(\sin 3A\): ...
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