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ljolja1713
@ljolja1713
June 2022
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Объясните, пожалуйста, как решить
1-1/cos^2a
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MolFarLittle
1/cos^2a=tg^2a+1
1-tg^2a-1=-tg^2a
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1-tg^2a-1=-tg^2a