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√3/2+2*(√3/3)=3√3/6+4√3/6=7√3/6
tg(180-30)= -tg30
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(1/2)ctg135-4cos60=(1/2)ctg(90+45)-4*(1/2)= -0,5tg45-2= -0,5*1-2= -0,5-2= -2,5
b)