Question

How to use tan() function to compute the tangent of an angle of N radians in PHP

Answer 1

echo "tan(45 * M_PI / 180.0) = " . tan(45 * M_PI / 180.0) . "<br />";
echo "tan(3 * M_PI / 4) = " . tan(3 * M_PI / 4) . "<br />"; 
echo "tan(5 * M_PI / 4) = " . tan(5 * M_PI / 4) . "<br />"; 
echo "tan(7 * M_PI / 4) = " . tan(7 * M_PI / 4) . "<br />"; 
echo "tan(M_PI / 4) = " . tan(M_PI / 4) . "<br />"; 
echo "tan(0.0) = " . tan(0.0) . "<br />";
echo "tan(-0.0) = " . tan(-0.0) . "<br />";


 
 
/*
run:
     
tan(45 * M_PI / 180.0) = 1
tan(3 * M_PI / 4) = -1
tan(5 * M_PI / 4) = 1
tan(7 * M_PI / 4) = -1
tan(M_PI / 4) = 1
tan(0.0) = 0
tan(-0.0) = 0
     
*/

 

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