Предмет: Алгебра, автор: atarbaevaalena

упростите выражение sin^2a+cos^2a+ctg^2a

Ответы

Автор ответа: Alexandr130398

41

формулы:
sin²a+cos²a=1
1+ctg²a=1/sin²a

(sin²a+cos²a)+ctg²a=1+ctg²a=1/sin²a

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