Given that \( h(x)=x^{4} \), find \( (h \circ h)(x) \) \( (h \circ h)(x)= \) (Simplify your answer.)

Step 1 ：\( (h \circ h)(x) = h(h(x)) \)

Step 2 ：\( h(h(x)) = h(x^{4}) \)

Step 3 ：\( h(x^{4}) = (x^{4})^{4} \)