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valeriadachnko
@valeriadachnko
July 2022
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помогите пожалуйста, тригонометрия
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1989ma
1)
6ctg430-4tg20/4ctg110-3ctg470=6ctg(360+70)-4tg20/4ctg110-3ctg(360+110)=6сtg70-4tg20/4сtg110-3ctg110=6ctg(90-20)-4tg20/ctg110=6tg20-4tg20/ctg110=2ctg20/сtg110=2ctg20/ctg(90+20)=-2ctg20/tg20=-2ctg^2(20)
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Answers & Comments
6ctg430-4tg20/4ctg110-3ctg470=6ctg(360+70)-4tg20/4ctg110-3ctg(360+110)=6сtg70-4tg20/4сtg110-3ctg110=6ctg(90-20)-4tg20/ctg110=6tg20-4tg20/ctg110=2ctg20/сtg110=2ctg20/ctg(90+20)=-2ctg20/tg20=-2ctg^2(20)