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

A current source in a linear circuit has $i_S=10cos(At+25)A.$

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

Problem $09\mathrm{.}002.$b $-$ Angular frequency of a sinusoid

What is the angular frequency, where $A=20?$