(1+tg^2a)•cos^2a+ tg^2 a розвязок. Created by kino09201. algebra-ru

(1+tg^2a)•cos^2a+ tg^2 a розвязок...

kino09201 @kino09201

July 2022 1 14 Report

(1+tg^2a)•cos^2a+ tg^2 a розвязок

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solving05

Ответ:

Объяснение:

$(1+tg^2a)cos^2a+tg^2a=(1+\frac{sin^2a}{cos^2a})cos^2a+\frac{sin^2a}{cos^2a}=\\=cos^2a+sin^2a+\frac{sin^2a}{cos^2a}=1+\frac{sin^2a}{cos^2a}=\frac{cos^2a+sin^2a}{cos^2a}=\frac{1}{cos^2a}$

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