Question: use c o s c t = 1 2 [ e j c t + e - j c t ] and s i n

use cosct=12[ejct+e-jct] and sinct=12j[ejct-e-jct] to prove, that we can write x1(t)cosct-x2(t)sinct=R(t)*cos[ct+] providing coswct is much faster than x1(t) and x2(t).
use c o s c t = 1 2 [ e j c t + e - j c t ] and s

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