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"); echo(atan2(-0.50,-0.50) . "
"); echo(atan2(5,5) . "
"); echo(atan2(10,20) . "
"); echo(atan2(-5,-5) . "
"); echo(atan2(-10,10)); ?>
运行结果
0.78539816339745
-2.3561944901923
0.78539816339745
0.46364760900081
-2.3561944901923
-0.78539816339745