Simple Harmonic Motion (1 Viewer)

NickGero

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When doing these types of questions and working back from the acceleration, if you quote the formula in terms of t and x and then proceed to evaluate the constants, is it necessary to do so for both the sin and cos result. I'm asking this because there's been times where for example, the epsilon value for cos was say pi/6 (positive) and so I've put that down. Then, when I've checked the answers, it was actually negative pi/6 because if I was to have done the sin result as well I would've seen it was in the fourth quadrant, therefore explaining why cos would be positive and sin negative. Is the best way to get around this problem to simply evaluate the sin and cos displacement results, or it possible to determine this otherwise?

Thanks.
 

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