Determine which waveform in each pair is lagging:

a) 6 cos(100πt-1000) and -6 sin (2π60t+1300)

b) cos(10t-1000) and - cos(t-1000)

c) cos (50πt - 1000) + cos (50πt - 200) and 9 cos (100πt - 200)

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