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Math Help - How do you write equations as a product of trig functions?

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    How do you write equations as a product of trig functions?

    Write cos3x+cos4x as a product of trigonometric functions?
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    Re: How do you write equations as a product of trig functions?

    Quote Originally Posted by derek1008 View Post
    Write cos3x+cos4x as a product of trigonometric functions?
    one of the sum to product identities ...

    \cos{A} + \cos{B} = 2\cos\left(\frac{A+B}{2}\right)\cos\left(\frac{A-B}{2}\right)
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