sin630-tg420ctg750=sin(3π+90)-tg(2π+60)ctg(4π+30)=-sin(90)-tg(60)ctg(30)=-1-√3*√3=4;
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sin630-tg420ctg750=sin(3π+90)-tg(2π+60)ctg(4π+30)=-sin(90)-tg(60)ctg(30)=-1-√3*√3=4;