Let \( f(x)=\sqrt{x^{4}+15} \), then the graph of the function \( y... VIDEO
Let \( f(x)=\sqrt{x^{4}+15} \), then the graph of the function \( y \)
\( \mathrm{P} \)
\( =f(x) \) is symmetrical about
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(1) The \( x \)-axis
(2) The \( y \)-axis
(3) The origin
(4) The line \( x=y \)
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