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Автор - tamadaeva20

Упростите выражение:
sin^2 a-1/sin^2a*tg^2a

Ответ

Автор - Kазак

sin²(a) - 1/sin²(a)*tg²a = sin²(a) - 1/sin²(a)*sin²(a)/cos²(a) =  sin²(a) - 1/cos²(a)

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