Ответы на вопрос:
Sin(π/3)=sin(60°)=√3/2. cos(π/4)=cos(45°)=√2/2. ctg²(3π/4)=ctg²(135°)=ctg²(π/2+45°)=tg²(45°=1. tg(π/6)=tg(30°)=√3/3. sin(3π/2)=sin(270°)=sin(180°+90°)=-sin(90°)=1. √3/2+√2-1+√3/3-1=5√3/6+√2-2.
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