SOLUTION: cos(2x) + cos(4x)
Algebra.Com
Question 1056970: cos(2x) + cos(4x)
Answer by solve_for_x(190) (Show Source): You can put this solution on YOUR website!
The formula to use for this is:
Applying this to cos(2x) + cos(4x) gives:
Then, since cos(-x) = cos(x), we get:
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