Understanding digital signal processing's frequency domain, by Steve Lyons, November 2001, pg 40 had incorrect equations.

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Equation(2) read:
cos(2πf_ot) = e^j2πfot/2 + e^-j2πfot/2

it should read:
e^j2πfot = cos(2πf_ot) + jsin(2πf_ot)

In the fifth line of the second paragraph (left column of page), the sentence:
“Notice how the Ie^j2πfot signal spirals …”

should read:
“Notice how the e^j2πfot signal spirals …”

In the eighth line of the second paragraph (left column of page), the sentence:
“At time I = 0 the signal …”

should read,
“At time t = 0 the signal …”