78 À :: `+`(`*`(7, `*`(`^`(tg, 2), `*`(x))), `-`(`/`(1, `*`(`^`(sin(`+`(`*`(`/`(1, 2), `*`(Pi)), x)), 2)))), 1) = 0                              Á :: [−5π/2;−π] 

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À :: `+`(`*`(2, `*`(Pi, `*`(k)))) Á :: `+`(`-`(`*`(2, `*`(Pi))))