s(t) = [1 + a * x(t) ] * cos(2 __fct)
where fc is the carrier frequency
eg, if x(t) = cos(2 __fmt),
where fm is the modulating signal
then
s(t) = cos(2_fct) +
(a/2)(cos(2_(fc-- fm)t) + (cos(2_(fc-+ fm)t))
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