Sin(-9П/4)-tg(-7П/4)+cos17П/6

Question

Sin(-9П/4)-tg(-7П/4)+cos17П/6

Answer 1

Sin(-9П/4)=sin7П/4=-√2/2 tg(-7П/4)=tgП/4=1 cos17П/6=cos5П/6=-√3/2 (-√2/2)-1-(√3/2)=-(√2+√3)/2-1