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Problem $09\mathrm{.}002-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL PARTS

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A current source in a linear circuit has is $=15$ cos$($A t $+25)$ A$.$

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NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Problem $09\mathrm{.}002.$a $-$ Amplitude of a sinusoid

What is the amplitude of the current, where A $=23?$

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The amplitude of the current is A$.$