pertaining to an alternating quantity represented by the product of a real constant and a sine or cosine function whose argument is a linear function of the independent variable Note 1 to entry: The real constant may be a scalar, vector or tensor quantity. Note 2 to entry: Examples are a(t)=ˆAcos(ω t+ϑ0) and a(x)=ˆAcos[k(x−x0)].
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