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Romashka712
@Romashka712
July 2022
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Вычислите с помощью формул приведения:
1) sin 5π/4
2) cos (-7π/3)
3) tg 5π/3
4) sin 40π/3
5) ctg 1π/6
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Answers & Comments
elerh
1.sin5p/4=sin225=sin(270-225)=sin45=корень из двух на два
2.cos(-7p/3) cos(-x)=cosx cos (-7p/3)=cos(7p/3)=cos(2p+p/3)=cosp/3=1/2
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Answers & Comments
2.cos(-7p/3) cos(-x)=cosx cos (-7p/3)=cos(7p/3)=cos(2p+p/3)=cosp/3=1/2