How to solve this trigonometric equation: cos(x) * cos(2x) * cos (3x) = 1? Thank you!
1 Answer
Mar 26, 2018
Explanation:
Since
- all three are 1
- two of them are -1, and the third is equal to +1
The first possibility would mean that
The second would happen when
Combining the rtwo together we get the solution set
Note : in the second case we could not have taken