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Matematica – Relaçoes triogonometricas
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1.Sendo cosx= 4/5 e o < x < pi/2,calcule o valor de sen2x-3.cosx
2.Sabendo que senx= 3/5,com 0< x < pi/2,determine cos2x
3.sabendo que senx= 1/3,com pi/2< x pi, determine o valor de cotgx
4.Demonstre que cosx.tgx.cossecx = 1
5.Sabendo-se que senx= 5/6, calcule:
a) Sen(pi+x)
b)cos(pi/2-x)
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