1) <span>sin п-tg 3п/4 = 0 - (-1) = 1</span>
<span>2) <span>tgп*ctgп/4+cosп/2*sin(-2п/3) = 0</span></span>
<span><span>3) <span>sin 150-соs 720+ tg 225 = sin(180-30)-cos360+tg(270-45)=-(1/2)-1-1=-2,5</span></span></span>