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-   -   Trigonometry qusetion (https://www.askmehelpdesk.com/showthread.php?t=329433)

  • Mar 15, 2009, 06:53 AM
    wazhma1991
    Trigonometry qusetion
    sin(-2A)=-2sinAcos(-A)
  • Mar 21, 2009, 07:30 AM
    vitaminh

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

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