Question: If y 1 = 2 0 c o s ( t - 3 0 ) and y 2 = 4 0 c o s (

If y1=20cos(t-30) and y2=40cos(t+60), express y=y1+y2 as a single sinusoidal function.
a) Solve by using trigonometric identities.
b) Solve by using the phasor concept.
If y 1 = 2 0 c o s ( t - 3 0 ) and y 2 = 4 0 c o

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