Write cos3x+cos4x as a product of trigonometric functions?

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- Nov 13th 2012, 02:03 PMderek1008How do you write equations as a product of trig functions?
Write cos3x+cos4x as a product of trigonometric functions?

- Nov 13th 2012, 04:44 PMskeeterRe: How do you write equations as a product of trig functions?