Happy New Year!!!
I hope I'm welcome
Having trouble solving this problem
"Write cos 3x as sums of powers of cos x"
I tried expanding it by cos 3x = cos (2x + x) and applying the identities obtaining cos 2x cos x - sin 2x sin x
But I don't know what to do next. What does it means to write cos 3x as sums of powers of cos x?
Wish you the best of luck!!!
I hope I'm welcome
Having trouble solving this problem
"Write cos 3x as sums of powers of cos x"
I tried expanding it by cos 3x = cos (2x + x) and applying the identities obtaining cos 2x cos x - sin 2x sin x
But I don't know what to do next. What does it means to write cos 3x as sums of powers of cos x?
Wish you the best of luck!!!