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Irinaa1690765
@Irinaa1690765
July 2022
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Вычислите ctga, если cosa=-0,4 и 90 градусов а - это альфа. Ответ должен получится : -2/корень из 21. Распишите решение
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Марика07
Sin²α+cos²α=1
sin²α=1-cos²α
sin²α=1-(-0,4)²=0,84
sinα=+-√0,84=+-0,2√21
90<α<180 значит sinα=0,2√21
ctgα=cosα/sinα
ctgα=-0,4/(0,2√21)=-2/√21
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Answers & Comments
sin²α=1-cos²α
sin²α=1-(-0,4)²=0,84
sinα=+-√0,84=+-0,2√21
90<α<180 значит sinα=0,2√21
ctgα=cosα/sinα
ctgα=-0,4/(0,2√21)=-2/√21