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<?php //task 2 $n = 15624; echo strrev($n)."<br>"; //task1 $a = 3; $b = 21; $m = 3.27; echo $res = ($m*log($m) + $a * sin($a * $m)) / $b * cos($b); //task3 $arr = array(1, 2, 3); $arrSum = array_sum($arr); echo ($arrSum / count($arr)); //task4 ?>