51 À :: `+`(`*`(6, `*`(`^`(sin, 2), `*`(x))), `-`(`*`(5, `*`(sin, `*`(x)))), `-`(4)) = 0                                    Á :: [−7π/2;/3π/2] 

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À :: `+`(`*`(`/`(1, 6), `*`(`^`(-1, `+`(n, 1)), `*`(Pi))), `*`(Pi, `*`(n))), `in`(n, Z) Á :: `+`(`-`(`*`(`+`(`*`(17, `*`(Pi))), `/`(1, 6)))); 1; `+`(`-`(`*`(`+`(`*`(13, `*`(Pi))), `/`(1, 6))))