- #1
Boorglar
- 210
- 10
What are some examples of functions such that
[itex] f(nx) = a_{k}f(x)^{k}+...+a_{1}f(x)+a_{0} [/itex]
for some integers n, k, and integer coefficients in the polynomial?
The only example I can think of is cos(x), for which [itex] \cos(2x) = 2\cos(x)^{2}-1 [/itex] and there are similar relations for n = 3, 4, etc.
Are these the only possible examples expressible in terms of elementary functions?
[itex] f(nx) = a_{k}f(x)^{k}+...+a_{1}f(x)+a_{0} [/itex]
for some integers n, k, and integer coefficients in the polynomial?
The only example I can think of is cos(x), for which [itex] \cos(2x) = 2\cos(x)^{2}-1 [/itex] and there are similar relations for n = 3, 4, etc.
Are these the only possible examples expressible in terms of elementary functions?