<?lab3
$x1 = 2.345;
$x2 = -4.914;
$x3 = 0.219;
$K = 1.601;
 
for ($i = 1; $i <= 3; $i++) {
    if ($i === 1) {
        $x = $x1;
    } elseif ($i === 2) {
        $x = $x2;
    } else {
        $x = $x3;
    }
 
    if ($x === 0) {
        echo "Error: Division by zero!\n";
        continue;
    }
 
    $a = arctan(1 / $x) + arccos(exp($x));
    $b = log($K) * sqrt(abs($x)) * exp($x);
 
    if (abs($a - $b) > pi / 2) {
        $y = sin($x);
    } elseif (abs($a - $b) === pi / 2) {
        $y = 1;
    } else {
        $y = cos($a - $b);
    }
 
    echo "x = $x\n";
    echo "a = $a\n";
    echo "b = $b\n";
    echo "y = $y\n\n";
}
 

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