# If \$ f (x) = sin ^ 4 (6x) + cos ^ 4 (6x) \$ is a sine wave, look for amplitude, phase, and period.

Yes $$f (x) = sin ^ 4 (6x) + cos ^ 4 (6x)$$ is a sine wave, find the amplitude, phase and period.

I do not know how to work with $$sin ^ 4$$ and $$cos ^ 4$$I tried to use the formula, but it does not work because of the $$4$$e degree. Allusions?