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    wazhma1991's Avatar
    wazhma1991 Posts: 8, Reputation: 1
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    #1

    Mar 15, 2009, 06:53 AM
    Trigonometry qusetion
    sin(-2A)=-2sinAcos(-A)
    vitaminh's Avatar
    vitaminh Posts: 3, Reputation: 1
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    #2

    Mar 21, 2009, 07:30 AM

    yes: use some basic identities: sin(2A) = 2sin(A)cos(A) , sin(-A)=-sin(A), cos(-A)=cos(A)
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