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mkmkmk1
@mkmkmk1
October 2021
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помогитее
1)1+tg^2 а - 1/соs^2 а
2)tg a*ctg a-cos^2 a - sin^2 a
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Александр20060403
tg^2a=sin^2a/cos^2a, 1=cos^2a/cos^2a. Отсюда получаем: 1+tg^2a=(cos^2a+sin^2a)/cos^2a=1/cos^2a
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