18. sin25•sin35•sin85

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sin 25^{\circ} . sin 35^{\circ} . sin 85^{\circ} = \frac{{cos x}^{\circ}}{a}

c o s

(x + a)

sin 85^{\circ} - sin 35^{\circ} - cos 65^{\circ}

\frac{sin 35^{\circ}}{cos 55^{\circ}} + \frac{cos 55^{\circ}}{sin 35^{\circ}} - 2 {cos}^{2} 60^{\circ}

{(\frac{s i n 35^{\circ}}{c o s 55^{\circ}})}^{2} + {(\frac{c o s 55^{\circ}}{s i n 35^{\circ}})}^{2} - 2 c o s 60^{\circ}

\frac{cos 55^{\circ}}{sin 35^{\circ}} - \frac{sin 42^{\circ}}{cos 48^{\circ}} =

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