July 2023 1 10 Report
Даю 100 баллов:
Докажите тождество.
а) (1 + sin^2 a)ctg^2 a - ((1) / sin^2 a) = - sin^2 a
б) ((sin^2 a) / (1 + ctg^2 a * (cos^2 a - 1))) = 1
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