Question

1.sina+sin5a/ cosa+cos5a, а=П/12

2. √3( cosП/12- cos5П/12)

3. sin10°+sin50°-cos20°

4. ( cos16°-cos24°-cos32°+cos40°)/(cos86°sin8°cos28°)

5. (sinx-2sin2x+sin3x)/(cosx-2cos2x+cos3x), x=П/4

6. (cosa-cos2a-cos4a+cos5a)/(sina-sin2a-sin4a+sin5a), a=П/4​