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dotka666
@dotka666
August 2022
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Вычислите:
sin(П/9)*sin(-П/9) - cos(П/9)*cos(-П/9)+tg(-П/12)*ctg(П/12)=
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sin(П/9)*sin(-П/9) - cos(П/9)*cos(-П/9)+tg(-П/12)*ctg(П/12)=-cos(П/9-П/9)+1=-cos0-1=
=-1-1=-2
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=-1-1=-2