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Perform the following operation and determine an expression for e(t); e(t)=10sin(omega t +30degrees)-10cos(omega t -45degrees)
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10cos(90-wt-30) +10cos (wt-45) 10[cos(wt-60) +cos (wt-45)]
20cos(wt+105/2)cos(15/2)
\[6.08\cos (\omega t - 7.5)\]
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