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Scooby1
@Scooby1
August 2022
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народ , 3 номера любые . Всем спасибо )))
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Татьяна4481
1) cos 780= cos (360+360+60)=1/2
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Татьяна4481
2 пример: 1-sin x*tg x*cos x=1-sinx*(sinx/cosx)*cosx=1-sin^2x=cos^x; 1+tg^x=1/cos^x; cos^2 x*1/cos^2x=1
Татьяна4481
3 пример: tgx=1/ctgx отсюда 6/ctgx-1=6/3-1=1
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