a) 2tgx + (tgx - 1)² = 2tgx + tg²x - 2tgx + 1 = tg²x + 1 = 1/Cos²x
б) (tgy + Ctgy)(1 + Cosy)(1 - Cosy) = (tgy + Ctgy)(1 - Cos²y) = (tgy + Ctgy) * Sin²y=
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a) 2tgx + (tgx - 1)² = 2tgx + tg²x - 2tgx + 1 = tg²x + 1 = 1/Cos²x
б) (tgy + Ctgy)(1 + Cosy)(1 - Cosy) = (tgy + Ctgy)(1 - Cos²y) = (tgy + Ctgy) * Sin²y=