If \( \tan 25^{\circ}=x \), prove that \( \frac{\tan 155^{\circ}-\tan 115^{\circ}}{1+\tan 155^{\...
If \( \tan 25^{\circ}=x \), prove that \( \frac{\tan 155^{\circ}-\tan 115^{\circ}}{1+\tan 155^{\circ} \tan 115^{\circ}}=\frac{1-x^{2}}{2 x} \).
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