Im having trouble comparing sinusoidal waves and their phases.(adsbygoogle = window.adsbygoogle || []).push({});

As a sample problem I was given

v_1=120cos(120*pi*t - 40deg)

and i_1=2.5cos(120*pi*t +20deg)

and I was asked to find the angle by which i_1 lags v_1.

I have no clue on how to go through with this problem, I dont even know where to start..

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# Homework Help: Lagging and leading

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