&lt;?php    function sum&#40;$num1, $num2&#41;    &#123;        $total = $num1 + $num2;        echo &quot;cos($total)&quot;;     &#125;    sum&#40;5,-5&#41;;    ?&gt;
A. 0
B. 1
C. 0.5
D. -0.5
Answer:A
&lt;?php    function sum&#40;$num1, $num2&#41;    &#123;        $total = $num1 + $num2;        echo &quot;cos($total)&quot;;     &#125;    sum&#40;5,-5&#41;;    ?&gt;
A. 0 B. 1 C. 0.5 D. -0.5
Explanation: cos() gives the cos value of the argument. Here the function returns 1.