Упростите: sin пи/18*cos пи/9+sin пи/9* cos пи/18 / sin пи/36* cos 35пи/18 + sin 35пи/18* cos пи/36

Упростите: \( \sin{\frac{\pi}{18}} \cdot \cos{\frac{\pi}{9}} + \sin{\frac{\pi}{9}} \cdot \cos{\frac{\pi}{18}} / \sin{\frac{\pi}{36}} \cdot \cos{\frac{35\pi}{18}} + \sin{35\frac{\pi}{18}} \cdot \cos{\frac{\pi}{36}} \)