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Lifa
@Lifa
July 2022
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Решите срочно пожалуйств
13/cos^2 71+cos^2 341
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DariosI
Verified answer
13/(cos^2 71+cos^2 341=
cos 341=cos(180+161)=-cos161=-cos(
π/2+71)=-(-sin71)=sin71
cos² 71+cos² 341=sin²71+cos²71=1
13/(cos^2 71+cos^2 341)=
13/1=13
2 votes
Thanks 1
Lifa
Спасибо огромное, проверьте тут пожалуйста http://znanija.com/task/17124626
Lifa
помоги прошуhttp://znanija.com/task/17266120
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Answers & Comments
Verified answer
13/(cos^2 71+cos^2 341=cos 341=cos(180+161)=-cos161=-cos(π/2+71)=-(-sin71)=sin71
cos² 71+cos² 341=sin²71+cos²71=1
13/(cos^2 71+cos^2 341)=13/1=13