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Math Help - Express f(x) in form of f(x)=Acos(Bx-C)

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    Express f(x) in form of f(x)=Acos(Bx-C)

    a) express f(x) in form of f(x)=Acos(Bx-c) where -pi/2<C<pi/2
    f(x)= 3cos2x-/sqrt sin2x
    I don't have any idea how to start...
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    Quote Originally Posted by dorkymichelle View Post
    a) express f(x) in form of f(x)=Acos(Bx-c) where -pi/2<C<pi/2
    f(x)= 3cos2x-/sqrt sin2x
    I don't have any idea how to start...
    This link has the formula
    List of trigonometric identities - Wikipedia, the free encyclopedia

    Give it a try and post again if you get stuck.
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