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Arita
@Arita
July 2022
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- cos 720+tg 30-ctg 210+sin 120
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anya9797
-сos720+tg30-ctg210+sin120=-cos0+tg30-ctg(270-60)+sin(180-60)=
=-1+1/√3+tg60+sin60=-1+√3/3+√3+√3/2=(-6+2√3+6√3+3√3)/6=(-6+11√3)/6
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=-1+1/√3+tg60+sin60=-1+√3/3+√3+√3/2=(-6+2√3+6√3+3√3)/6=(-6+11√3)/6