упростите выражение
1. (1-cos²α )/( cos²α-cos2α)
2. (1-sin²α )/ (cos2α+sin² α)
3. (1+sin²α )/ (2cosα+sin2 α)
упростите выражение
1. (1-cos²α )/( cos²α-cos2α)
2. (1-sin²α )/ (cos2α+sin² α)
3. (1+sin²α )/ (2cosα+sin2 α)
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