Para os pares de senoides a seguir, determine qual delas está adiantada e por quanto?
(a) υ(t) = 10 cos(4 t – 60°) e i(t) = 4 sen(4 t + 50°)
(b) υ1(t) = 4 cos(377 t + 10°) e υ2(t) = −20 cos 377 t
(c) x(t) = 13 cos 2 t + 5 sen 2 t e y(t) = 15 cos(2 t – 11,8°)
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