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Re: [obm-l] SOMA DAS RAÍZES
- To: obm-l@xxxxxxxxxxxxxx
- Subject: Re: [obm-l] SOMA DAS RAÍZES
- From: "Marcelo Salhab Brogliato" <msbrogli@xxxxxxxxx>
- Date: Wed, 12 Sep 2007 17:58:02 -0300
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Olá Arkon,
uma outra idéia seria:
sen(3x) + sen(2x) = 2sen(5x/2)cos(x/2) = 0
5x/2 = kpi ... x = 2kpi/5 ... raizes: 0, 2pi/5, 4pi/5
ou
x/2 = pi/2 + kpi ... x = pi + 2kpi ... raizes: pi
novamente: 11pi/5
abraços,
Salhab
On 9/12/07, arkon <arkon@xxxxxxxxxx> wrote:
>
>
>
> Alguém pode resolver, por favor, esta:
>
>
>
> (AFA-97) A soma das raízes da equação sen 3x + sen 2x = 0 para 0 <= x < = pi
> é :
>
>
>
> a) 6.pi/5. b) 9.pi/5. c) 11.pi/5.
> d) 13.pi/5.
>
>
>
> DESDE JÁ MUITO OBRIGADO
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