Тригонометрия.
1) 2*корень из 2*sin13п/8 *cos12п/8 =
2) Корень из 27*cos^2 *13п/12 -корень из 27*sin^2 *13п/12 =
3) 10cosa-2sina/sina-5cosa+5 = , если tga = 5
4) 3sina+5cosa+1/2sina+cosa+4 = 1/4 ? tga=?
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