The phasor form of a cosine function is A*cos(ωt + φ), where A is the amplitude, ω is the angular frequency, t is the time, and φ is the phase angle.
For the expression 2cos(20t) + 10 - 5cos(20t-30), we can rewrite it as:
2*cos(20t) - 5*cos(20t-30) + 10
Now,
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