2cos^{2}\alpha=1+cos2\alpha Докажите тождество. . Created by aset2505. algebra-ru

2cos^{2}\alpha=1+cos2\alpha Докажите тождество. ...

aset2505 @aset2505

August 2022 1 3 Report

2cos^{2}\alpha=1+cos2\alpha

Докажите тождество.

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rokfeller007

$2cos^{2}\alpha=1+cos2\alpha\\cos^{2}\alpha-1=cos2\alpha-cos^{2}\alpha\\-sin^2\alpha=cos2\alpha-cos^{2}\alpha\\cos^{2}\alpha-sin^2\alpha=cos2a\\-1=cos2a\\cosa=-0,5\\a_1=2\pi/3б2\pi k\\a_2=4\pi/3б2\pi k$

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