Ответ:

  1. \(\sin 100^\circ=\sin(180^\circ-80^\circ)=\sin 80^\circ\).
  2. \(\cos 170^\circ=\cos(180^\circ-10^\circ)=-\cos 10^\circ\).
  3. \(\sin 95^\circ=\sin(90^\circ+5^\circ)=\cos 5^\circ\).
  4. \(\cos 100^\circ=\cos(90^\circ+10^\circ)=-\sin 10^\circ\).
  5. \(\sin 260^\circ=\sin(270^\circ-10^\circ)=-\cos 10^\circ\).
  6. \(\cos 280^\circ=\cos(270^\circ+10^\circ)=\sin 10^\circ\).

Ответ: \(\sin80^\circ;\ -\cos10^\circ;\ \cos5^\circ;\ -\sin10^\circ;\ -\cos10^\circ;\ \sin10^\circ\).