For the following pairs of sinusoids, determine which one leads and by how much.
(a) v(t) = 10 cos(4t – 60°) and i(t) = 4 sin(4t + 50°)
(b) v1(t) = 4 cos(377t + 10°) and v2(t) = −20 cos 377t
(c) x(t) = 13 cos 2t + 5 sin 2t and y(t) = 15 cos(2t – 11.8°)
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