&lt;?php      echo&#40;atan&#40;0.50&#41;&#41;;  ?&gt;
A. 0.11845976421345
B. 0.23568451142521
C. 0.46364760900081
D. 1
Answer:A
&lt;?php      echo&#40;atan&#40;0.50&#41;&#41;;  ?&gt;
A. 0.11845976421345 B. 0.23568451142521 C. 0.46364760900081 D. 1
Explanation: The atan() function returns the arc tangent of arg as a numeric value between -Pi/2 and Pi/2 radians.