For the following pairs of signals, determine if v1 leads or lags v2 and by how much.
(a) v1 = 10 cos(5t – 20°), v2= 8 sin 5t
(b) v1 = 19 cos(2t + 90°), v2= 6 sin 2t
(c) v1 = −4 cos 10t, v2= 15 sin 10t
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