
### Instruction: help me answer this question cos 6x = 32 cos6 x – 48 cos4 x + 18 cos2 x – 1, think step by step
### Assistant: cos 6x = cos 3(2x), and using the formula cos 3A = 4 cos3 A – 3 cos A, it can be written as 4 cos3 2x – 3 cos 2x. Further simplification yields the given expression. , The answer is True
