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MMchar
@MMchar
January 2020
1
43
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Sabendo que sen (x) =
3
/5
com x ∈
[π
/2
, π] , encontre cos(x) e tg (x).
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decioignacio
Cos²x = 1 - sen²x
cos²x = 1 - _9_
25
cos²x = _16_
25
cosx = - _ 4_ ⇒ por ser do IIº quadrante!
5
tgx = _senx_ ⇒ tgx = _3/5_ ⇒ tgx = - _3_
cosx -4/5 4
1 votes
Thanks 2
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Lista de comentários
cos²x = 1 - _9_
25
cos²x = _16_
25
cosx = - _ 4_ ⇒ por ser do IIº quadrante!
5
tgx = _senx_ ⇒ tgx = _3/5_ ⇒ tgx = - _3_
cosx -4/5 4