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RieqyNS13 | PRO | 11/21/18 01:41:06 PM UTC | 0 ⭐ | 373 👁️ | Never ⏰ | []
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<?php 
 
$fungsi="3*pow(x,3)+4*pow(x,2)";
 
$fungsi=preg_replace_callback("/(pow\(.,)(\d+)\)/i", function($m){
    $pangkat=$m[2];
    return $pangkat.'*'.$m[1].($pangkat-1).')';
},$fungsi);
 
echo $fungsi;

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