Оч легко. 15 баллов.Объясните, почему:sin²(90°+27°) = cos²(27°). Created by TorchWooold. matematika-ru

Оч легко. 15 баллов.Объясните, почему:sin²(90°+27°) = cos²(27°)...

July 2022 1 10 Report

Оч легко. 15 баллов.
Объясните, почему:

sin²(90°+27°) = cos²(27°)

Answers & Comments

sedinalana Sin(90+a)=cosa формула приведения
sin²(90+27)=cos²+27
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могу доказать формулу
sin(90+a)=sin90*cosa+cos90*sina=1*cosa+0*sina=cosa

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