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1)ctg^2 a+ 1-2sin^2 a/2cos^a-1
2)1/ cosx(sin^2 x+cos^2 x + tg^2 x)
1)ctg^2 a+ 1-2sin^2 a/2cos^a-1
2)1/ cosx(sin^2 x+cos^2 x + tg^2 x)
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cot-В КВАДРАТЕ
sin-в квадрате
cos-сверху а
sec(x)(sin2(x)+tan2(x))