The function \( f(x)=x^{4}-62 x^{2}+a x+9 \) attains its maximum value on the interval \( [0,2] ...

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The function \( f(x)=x^{4}-62 x^{2}+a x+9 \) attains its maximum value on the interval \( [0,2] \) at \( x=1 \). Then, the value of \( a \) is
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