July 2022 1 6 Report
Дорогие друзья, помогите, пожалуйста, доказать тождества:

1. ctg10ctg50ctg70=ctg30
2. sin10sin30sin50sin70=1/16
3. sin(3π/10)-sin(π/10)=0.5
Заранее ОГРОМНОЕ СПАСИБО!!!!
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