Created
October 7, 2015 08:30
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atan2
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| // atan2(y, x) = | |
| // | |
| // y y | |
| // pi/2|\ pi/2|\ | |
| // | | | |
| // pi | 0 pi | 0 | |
| // ---------o---------> x =>> ---------o--------> x | |
| // -pi | -0 pi | 2 pi | |
| // | | | |
| // | | | |
| // -pi/2| 3/2pi| | |
| // |
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