1. Упростите выражение (-1+cos²α)ctg²α.
А) -sin²α
Б) sin²α
В) cos²α
Г) -cos²α
2. Упростите выражение (-1+sin²α)tg²α.
А) -sin²α
Б) sin²α
В) cos²α
Г) -cos²α
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