Предмет: Алгебра, автор: nastyasanchez1

Упростить выражение.
а) 1 - 1/cos^2(p-a)

Ответы

Автор ответа: dasdasfa
0
1- 1/cos^2 (π-a)=1- 1/cos^2a=(cos^2 a-1)/cos^2 a=(cos^2 a-sin^2 a-cos^2 a)/cos^2 a=-sin^2 a /cos^2 a=-tg^2 a
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