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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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