Помогите решить. Попытка выложить номер 3. Created by Sidorovich. algebra-ru

Помогите решить. Попытка выложить номер 3...

Sidorovich @Sidorovich

August 2022 1 10 Report

Помогите решить. Попытка выложить номер 3

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NNNLLL54

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$2cos(\pi -a)+ (\frac{sina+tga}{tga} )^2-cos^2a=-2cosa+( \frac{sina}{tga}+1)^2-cos^2a=\\\\=-2cosa+(cosa+1)^2-cos^2a=\\\\=-2cosa+cos^2a+2cosa+1-cos^2a=1$

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