Помогите срочно ! 1)Вектора a(x;4;z) коллинеарен вектору b ( -24;12;3) Найти произведение xz 2)Найти [tex]\sqrt{240} *ctg(a)[/tex] если [tex]\frac{1+cos(2a)}{5sinx^{2}(a) } =6[/tex] a ∈ [2; [tex]\frac{5\pi }{2}[/tex]]
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