Basic trig question for physics

1. Oct 12, 2006

laminar

I have to calculate the phase constant for a mass and spring system for simple harmonic motion. If I find that phi equals the arctan of some negative over another negative number, do I have to add pi to the answer for it to be in quadrant III?

I know this is more of a precalculus question but I don't know if the rules are different for physics.

2. Oct 12, 2006

courtrigrad

yes, you have to add $$\pi$$.

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