ctg(α)tg(α)=1;
cos(α)²+sin²(α)=1;
формулы приведения cos/sin/tg/ctg(π/0.5π/1,5π/2π+-α
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ctg(α)tg(α)=1;
cos(α)²+sin²(α)=1;
формулы приведения cos/sin/tg/ctg(π/0.5π/1,5π/2π+-α