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| Made for [mistakes](http://macwright.org/mistakes/#5069332) |
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| // degrees to radians | |
| // (90 * D2R) = 1.57; // Math.PI / 2 | |
| D2R = Math.PI / 180; | |
| // radians to degrees | |
| // (1.57 * R2D) = 90; | |
| R2D = 180 / Math.PI; | |
| D2R * R2D; // inverses of each other | |
| 180 * D2R; | |
| // == Math.PI |
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