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peandra
@peandra
August 2022
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Помогите решить пример
cos^2x-tg^2x=1.
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Answers & Comments
Madina7182
Cos^2x-tg^2x=cos^2x+sin^2x
-tg^2x-sin^2x=0 tg^2x=sin^2x/cos^2x
-sin^2x/cos^2x-sin^2x=0
-sin^2x-sin^2xcos^2x=0
-sin^2x(1+cos^2x)=0
-sin^2x=0 1+cos^2x=0
cos^2x=-1
и в книги должны быть даны формулы
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Answers & Comments
-tg^2x-sin^2x=0 tg^2x=sin^2x/cos^2x
-sin^2x/cos^2x-sin^2x=0
-sin^2x-sin^2xcos^2x=0
-sin^2x(1+cos^2x)=0
-sin^2x=0 1+cos^2x=0
cos^2x=-1
и в книги должны быть даны формулы