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CherToffKo
@CherToffKo
July 2022
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ПОМОГИТЕ НАЙТИ ctgа, если cos2a=-0,28 , a€(п/2,п)
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au456
Verified answer
Sin2a=Sqrt(1-cos^2(2a))=-0.96 т.к 2a от Pi до 2Pi
Ctg a = (1+cos 2a)/sin 2a = -0.75
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Answers & Comments
Verified answer
Sin2a=Sqrt(1-cos^2(2a))=-0.96 т.к 2a от Pi до 2PiCtg a = (1+cos 2a)/sin 2a = -0.75