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How to add “nonnegative” to DAE
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- Generally every negative has its positive when dealing with trig functions, so are you also saying that combinations of angles that would result in different signs of the trig function combinations (or the one) is invalid?
- Is it possible that your solution that finds negative angles and velocity isn't really valid when concidering the angle may be pointing directly opposite what you would expect, which would also therefore have a negative velocity and be a valid mathematical solution, but would need to be interpreted correctly to agree with your apperatus?
- Is the system of equations and functions such that there has to be some 'unwrap'-like done?
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