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DanJR
@DanJR
December 2019
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Considere a expressão
Qual é o seu valor:
a)
b)
c)
d)
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albertrieben
Verified answer
Boa noite
proriedadade dos logs
5^5log(x) = x
x = sen(300)*cos(120)*tg(1)*tg(89)*tg(2)*tg(88)*tg(45)
tg(1)*tg(89) = 1 (como 1 + 89 = 90, tg(89) = cotg(1) e tg(1)*cotg(1) = 1)
tg(2)*tg(88) = 1
tg(3)*tg(97) = 1
sen(300) = -√3/2
cos/120)*= -1/2
tg(45) = 1
x = (-√3/2)*(-1/2)*1
x = √3/4 (B)
2 votes
Thanks 3
DanJR
Obrigado, Albertrieben!!
albertrieben
disponha
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Verified answer
Boa noiteproriedadade dos logs
5^5log(x) = x
x = sen(300)*cos(120)*tg(1)*tg(89)*tg(2)*tg(88)*tg(45)
tg(1)*tg(89) = 1 (como 1 + 89 = 90, tg(89) = cotg(1) e tg(1)*cotg(1) = 1)
tg(2)*tg(88) = 1
tg(3)*tg(97) = 1
sen(300) = -√3/2
cos/120)*= -1/2
tg(45) = 1
x = (-√3/2)*(-1/2)*1
x = √3/4 (B)