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relação fundamental da trigonometria
sen²(x) + cos²(x) = 1
sen²(x) + (1/4)² = 1
sen²(x) + 1/16 = 16/16
sen²(x) = 15/16
sen(x) = √15/4
tg(x) = sen(x)/cos(x) = (√15/4)/(1/4) = √15
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relação fundamental da trigonometria
sen²(x) + cos²(x) = 1
sen²(x) + (1/4)² = 1
sen²(x) + 1/16 = 16/16
sen²(x) = 15/16
sen(x) = √15/4
tg(x) = sen(x)/cos(x) = (√15/4)/(1/4) = √15
pronto