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In the equation below,would the fundamental frequention be 1 (corresponding to the value cos(1x-pi)) and the harmonics amplitude 3 and -4?Also,the values of the frequency of the harmonic are equal (both 3),so how would it be represented in the domain frequency?

Considering x=w0t

v(t)=3sin(3x) - 4cos(3x) + cos(x-pi)

cos(x-pi)=cosx (is this right??),so

v(t)=3sin(3x) - 4cos(3x) + cos(x)

Thanks in advance for the reply!