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zhenya345
@zhenya345
August 2021
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Преобразуйте выражения:
1) 1 - sin^2 альфа - cos^2 альфа
2) cos^2 альфа - ( 1 - 2sin^2 альфа)
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lidusya13
1)=cos^2 a-cos^2 a=0;
2)=cos^2 a-(1-sin^2 a- sin^2a)=cos^2 a-cos^2 a+sin^2 a=sin^2 a
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Answers & Comments
2)=cos^2 a-(1-sin^2 a- sin^2a)=cos^2 a-cos^2 a+sin^2 a=sin^2 a