Rewrite-cos6xcos-4x-as-a-sum-or-difference-

Question Number 107976 by anonymous last updated on 13/Aug/20

R e w r i t e \cos 6 x \cos 4 x a s a s u m o r

d i f f e r e n c e

Answered by mathmax by abdo last updated on 13/Aug/20

\cos (4 x) \cos (6 x) = \frac{1}{2} {\cos (10 x) + \cos (2 x)}