R Robin New member Dec 3, 2012 #1 Write the product as a sum or difference of trigonometric functions. A.) cos9x-cos13x B.) cos 13X+cos9x C.) 1/2(cos 13x +cos 9x) D.) sin 13x + sin9X ~Thanks from Ro
Write the product as a sum or difference of trigonometric functions. A.) cos9x-cos13x B.) cos 13X+cos9x C.) 1/2(cos 13x +cos 9x) D.) sin 13x + sin9X ~Thanks from Ro
