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AnaSaint
@AnaSaint
January 2020
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Prove que cos (α- β) = cos α . cosβ + sen α. sen β
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renachess
Tomemos com exemplos 60° e 30°
Cos(60-30)=cos60*cos30+sen60+sen30
√3/2=1/2*√3/2+√3/2*1/2
√3/2=√3/4+√3/4
√3/2=2√3/4
√3/2 = √3/2
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Thanks 1
AnaSaint
Consegui chegar em uma resolução diferente, mas obrigada.
renachess
Este caso só vale para angulos complementares
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Lista de comentários
Cos(60-30)=cos60*cos30+sen60+sen30
√3/2=1/2*√3/2+√3/2*1/2
√3/2=√3/4+√3/4
√3/2=2√3/4
√3/2 = √3/2