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(π/18) * cos(π/9) + sin(π/9) * cos(π/18) / sin(π/36) * cos(35π/18) + sin(35π/18) * cos(π/36)