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Relação entre as razões trigonométricas de a e 270º+a
Redução ao 1º Quadrante: relação entre as razões trigonométricas de a e 270º+a
Compara:
* sin(a) e sin(270º+a)
* cos(a) e cos(270º+a)
* tan(a) e tan(270º+a)