Зная косинус и четверть найти sina, tga, ctgcosa = -.0,8 a Є III. Created by vladimirfox337. algebra-ru

Зная косинус и четверть найти sina, tga, ctgcosa = -.0,8 a Є III...

vladimirfox337 @vladimirfox337

July 2022 1 3 Report

Зная косинус и четверть найти sina, tga, ctg
cosa = -.0,8 a Є III

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$cosa=-0,8\\\\\alpha \in |||\; \; \; \to \; \; \; \; sina0\; \; ,\; \; ctga>0\\\\sina=-\sqrt{1-cos^2a}=-\sqrt{1-0,64}=-0,6\\\\tga=\frac{sina}{cosa}=\frac{0,6}{0,8}=\frac{2}{3}\\\\ctga=\frac{1}{tga}=\frac{3}{2}$

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