Let $a$ and $b$ be roots of $x^2-4x+1=0$ then what is $a^b(b^a)$

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Let $a$ and $b$ be roots of $x^2-4x+1=0$ then what is $a^b(b^a)$

I always worked with $ S $ and $P$ but for this sentence $a^b(b^a)$ no have idea.