American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Because complex numbers can be represented in both polar and rectangular notation, we can represent our polar ej2πfot quadrature signal (using one of Leonhard Euler's identities) in rectangular form as: above tells us that as ej2πfotrotates around the origin, its real part, its East-West distance from the origin, varies as a cosine wave.— EE Times-Asia
Next, we connect coax cables to the generators 'output connectors and run those two cables, labeled "Cosine" for our cosine signal and "Sine" for our sinewave signal, down the hall to their destination.— EE Times-Asia
So, if the current is sinusoidal, you know the derivative of a sine to be a cosine, which is 90° out of phase.

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