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How to use atan() function to compute the principal value of the arc tangent of N in PHP



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asked Apr 4, 2016 by avibootz
retagged Jun 13, 2025 by avibootz
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1 Answer

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echo "atan(1.0) = " . atan(1.0) . "<br />";
echo "atan(-1.0) = " . atan(-1.0) . "<br />";
echo "atan(0.0) = " . atan(0.0) . "<br />";
echo "atan(-0.0) = " . atan(-0.0) . "<br />";
echo "atan(INF) = " . atan(INF) . "<br />";
 
/*
run:
  
atan(1.0) = 0.78539816339745
atan(-1.0) = -0.78539816339745
atan(0.0) = 0
atan(-0.0) = 0
atan(INF) = 1.5707963267949
  
*/

 



answered Apr 4, 2016 by avibootz

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