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Prove that:(cos9x-cos5x)/(sin17 x-sin3x)...

Prove that:`(cos9x-cos5x)/(sin17 x-sin3x)=-(sin2x)/(cos10 x)`

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To prove the equation \[ \frac{\cos 9x - \cos 5x}{\sin 17x - \sin 3x} = -\frac{\sin 2x}{\cos 10x} \] we will simplify both the numerator and the denominator using trigonometric identities. ...
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