Question

How to use cos() function to get the cosine of an angle of N radians in PHP

Answer 1

echo "cos(-1) = " . cos(-1) . "<br />";
echo "cos(1) = " . cos(1) . "<br />";
echo "cos(0) = " . cos(0) . "<br />";
echo "cos(-0) = " . cos(-0) . "<br />";
echo "cos(0.9) = " . cos(0.9) . "<br />";
echo "cos(3.141593 / 3) = " . cos(3.141593 / 3) . "<br />";
echo "cos(3.141593 / 2) = " . cos(3.141593 / 2) . "<br />";
echo "cos(M_PI) = " . cos(M_PI) . "<br />";


/*
run: 

cos(-1) = 0.54030230586814
cos(1) = 0.54030230586814
cos(0) = 1
cos(-0) = 1
cos(0.9) = 0.62160996827066
cos(3.141593 / 3) = 0.49999989999998
cos(3.141593 / 2) = -1.732051033097E-7
cos(M_PI) = -1

*/

 

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