Using phasors, find:
(a) 3 cos(20t + 10°) –5 cos(20t – 30°),
(b) 40 sin(50t) + 30 cos(50t – 45°),
(c) 20 sin(400t) + 10 cos(400t + 60°) – 5 sin(400t – 20°)
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